Two suspected undocumented immigrants suffocated to death aboard a freight train and 10 others in need of medical care were taken by helicopter or ambulance to hospital on Friday in south Texas, police said.

Officials in Uvlade, Texas, received an anonymous emergency 911 call advising them that numerous immigrants were suffocating inside a train, Uvalde police said in a statement. At least 15 immigrants needed immediate medical attention, police said.

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US Border Patrol officials were notified and able to stop the train just east of Knippa, Texas, in Uvalde County, police said. Officials closed US Highway 90 temporarily to land the helicopters.

Federal investigators were looking into the possibility of human smuggling, investigators with the US Department of Homeland Security said.

The tragedy occurred near the site of a more grave incident last year, when 53 migrants died in the back of a tractor trailer amid the sweltering heat during a smuggling attempt.

Dozens of migrants were packed into the back of a truck found on the outskirts of San Antonio on June 27.

Two Americans have been indicted in federal court in that case and could face the death penalty if convicted. Two Mexicans have been charged with lesser crimes.

On Friday, Uvalde Police Chief Daniel Rodriguez suspected the migrants were dehydrated due to the heat of the train cars during warm weather, KSAT television reported.

“It’s sad to see that so many undocumented immigrants were found in this condition, and two of them lost their lives. It’s heartbreaking,” KSAT quoted Rodriguez as saying.

The Union Pacific railroad would lead the investigation, Uvalde police said.

The Mexican consulate in Eagle Pass, Texas, said on Twitter it was aware of the incident and in communication with US officials to determine if any of the victims were Mexican.

Homeland Security had yet to determine the nationalities of the victims or whether any families or children were among them, a department official with knowledge of the matter said, speaking on condition of anonymity.

Knippa is about 72 miles (115 km) west of San Antonio and about 120 miles (190 km) from the Mexican border.

It is near the town of Uvalde, which was the scene of a mass shooting at an elementary school in May last year that killed 19 school children and two teachers.

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US officials now expect that a phone call between President Joe Biden and China’s President Xi Jinping won’t happen as soon as they had hoped, as ties between the world’s two biggest economies continue to fray, according to people familiar with the matter.

China’s leaders still haven’t responded to US requests to set up the call, which American officials had said would take place soon after an annual meeting of the country’s legislature, the National People’s Congress, concluded March 13, said the people, who asked not to be identified discussing private deliberations.

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The US now expects a call won’t happen until after Taiwan’s president passes through the US in early April, the people said. That stop, which Chinese officials have already criticized, may include a meeting with House Speaker Kevin McCarthy.

The delay isn’t provoking panic but reflects a broader deterioration in the two countries’ relationship after a series of spats, testy exchanges and full-blown crises in recent months, all of which has been accompanied by increasingly aggressive rhetoric on both sides.

Asked to comment about the US assessment on the timing of a call, National Security Council spokeswoman Adrienne Watson dismissed it as “idle speculation by an unnamed official.”

“The two leaders will speak at some point in the coming weeks, but we have nothing specific to announce,” Watson said.

The delay fits an emerging pattern: China still hasn’t responded to Defense Secretary Lloyd Austin’s effort to speak with his Chinese counterpart, outreach the US made after Biden deployed US fighter jets to shoot down an alleged Chinese spy balloon that transited the US in February.

The balloon provoked a national uproar and led Secretary of State Antony Blinken to cancel a trip to Beijing. China said the balloon was a harmless weather craft that drifted off course and accused the US of “hyperventilating.”

US officials have said restoring communications is a top priority. Blinken has been looking to reschedule his trip, and others including Commerce Secretary Gina Raimondo and Treasury Secretary Janet Yellen may visit the People’s Republic of China.

“It’s important that we keep those lines of communication open, particularly now when tensions are so high,” National Security Council spokesman John Kirby said earlier in the week. “As a matter of fact, we’re having discussions with the PRC right now about a potential visit by Secretary Yellen and Secretary Raimondo to go over there and talk about economic issues.”

Biden has put a particular emphasis on using one-on-one chats with other leaders as a way to smooth relations. He last met Xi in person in November on the sidelines of a Group of 20 meeting in Bali, Indonesia. The two leaders’ pledge to arrest the slide in ties was drowned out by the balloon uproar as well as US accusations that China is moving closer to Russia and may provide it lethal assistance for the invasion of Ukraine.

Tsai’s visit to Central America will be the latest irritant. She’s expected to stop over in New York on March 29 and 30 and then again in Los Angeles a week later.

Such stopovers are normally routine but will draw new scrutiny given how bad the US-China relationship is now.

Lower-level contacts between the US and China have continued, including between the Pentagon and the Chinese military as well as a recent visit to Beijing by the head of the State Department’s new “China House,” Rick Waters.

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The US and Saudi Arabia completed their first counter-drone joint exercise last week at a new military testing center in Riyadh, according to the head of the United States Central Command (CENTCOM).

The exercise was the first of its kind between the two militaries, and US officials hope to replicate this with other armies in the region.

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The Red Sands Experimentation Center had been under discussion for some time. The US military said it would serve as an innovative approach to training and readiness between Washington and its Middle East partners.

Last week’s exercises were not highly publicized, but officials have said this was just the beginning of what they hope would be more in-depth and sophisticated drills.

The focus was on small Unmanned Aircraft Systems (UAS), an official with knowledge of the exercise said.

On Thursday, CENTCOM chief Gen. Erik Kurilla told lawmakers on the House Armed Services Committee that the counter-UAS drills involved live-fire exercises and allowed for studying complex threats and identifying weaknesses in other areas to counter drone activities.

He also hinted that directed energy weapons could be brought into the region at a later date in what is expected to be for air defense purposes.

Hours after Gen. Kurilla’s testimony on Capitol Hill, a one-way Iranian attack drone targeted US forces in Syria. An American contractor was killed, and five other troops were wounded alongside another US contractor.

Secretary of Defense Lloyd Austin said that the US retaliated, striking targets inside Syria linked to Iran’s Islamic Revolutionary Guards Corps (IRGC). He said the US airstrikes were in response to Thursday’s attack as well as a series of recent attacks against US and Coalition forces by groups backed by Iran.

On Thursday, Gen. Kurilla said that US forces had suffered 78 Iranian attacks since January 2021. The US had only responded three times, according to CENTCOM.

Last week’s joint exercise comes at a time when Saudi Arabia and Iran have agreed to normalize ties and restore diplomatic relations.

While Gen. Kurilla was asked several times during his Thursday testimony about the agreement, he repeatedly stated that it still needed to be implemented. Kurilla also said the mere fact that the Chinese-backed deal was reached did not mean that Iran’s malign activity was no longer a concern of regional countries.

Melissa Horvath, a non-resident senior fellow at the Middle East Institute (MEI), said the Red Sands exercises were an important way for the US to show continued commitment to Saudi Arabia and to build regional cooperation among Middle East allies in ways that go beyond traditional security assistance programs such as foreign military sales.

In recent years, the US has been accused of becoming disinterested, disengaged and leaving the Middle East to respond to more acute threats from Russia and China. This narrative has picked up steam since the Biden administration took office and the start of the Russian war on Ukraine.

Further criticism was levied upon the administration following this month’s diplomatic breakthrough between Riyadh and Tehran, which Beijing mediated. Washington said that China came through at the tail end of the negotiations and took the credit for what had been in the works for years.

“While the recent Chinese-brokered Saudi-Iran deal may de-escalate tensions in the region, it’s unlikely to eliminate all threats from small UASs – leaving continued opportunities for regional cooperation, new technologies, experimentation, and innovation,” Horvath told Al Arabiya English.

She pointed to Saudi Arabia establishing a joint venture with a Chinese firm to set up a research and development center focusing on UASs, including anti-drone solutions. “The US should be looking to remain the partner of choice in the region,” Horvath said, adding that the Red Sands drills would go a long way in demonstrating the value of partnering with the US and the superiority of US technology in countering UAS threats.

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