MEXICO CITY >> At least 53 people were killed and dozens injured in a horrific truck accident in southern Mexico on Thursday, authorities said, with most of the victims believed to be migrants coming from Central America.

The accident, which took place in southern Chiapas state, occurred when a truck carrying more than 100 people overturned Thursday afternoon near Tuxtla Gutierrez, the state capital, the head of the state Civil Protection Service, Luis Manuel Garcia Moreno, told Milenio TV.

The accident is one of the deadliest involving migrants in decades and follows the death of 13 migrants in a car accident on the U.S. border in March.

Garcia said that, based on witness testimony, the truck was traveling at excessive speed and then flipped over while rounding a sharp curve, with the trailer carrying the migrants then crashing into a pedestrian bridge and construction nearby.

Images and videos shared on social media showed more than a dozen bodies laid out on the road covered in white sheets near what appeared to be the twisted remains of an overturned vehicle.

The Civil Protection Service said on Facebook that an additional 58 people had been injured. The accident occurred on the highway between the town of Chiapa de Corzo and the state capital.

“My solidarity with the victims of the traffic accident,” the state’s governor, Rutilio Escandon, said on Twitter. “I have given instructions to provide prompt attention and assistance to the injured. Responsibility will be determined according to the law.”

Bordering Guatemala, the state of Chiapas has in recent years seen a surge of migrants from Central America, many of them being smuggled through Mexico on their way to the U.S. border. A record 1.7 million migrants, mainly from Mexico and Central America, were found trying to enter the United States illegally in the 12 months leading up to October.

Attempting to reach the United States, whether to seek asylum or to search for economic opportunities, is a dangerous and at times deadly process, with migrants having to travel through cartel-infested territory in northern Mexico, often paying steep prices to smugglers to get them to the border.

Migrants are regularly packed into trucks or cars as they make the journey north, and frequently fall prey to violence along the way. In January, the bodies of 19 people, most of them migrants, were found in a charred pickup truck near the U.S. border. A group of 12 police officers were later arrested in connection with the crime.

At least 3,575 deaths have been documented on the U.S.-Mexico border since 2014, according to the International Organization for Migration, with 650 people killed attempting to cross the U.S. border this year alone — the highest number since the organization began documenting deaths in 2014.

“The rising migrant death toll in the region is highly alarming,” Michele Klein-Solomon, the group’s regional director for Central, North America and the Caribbean, said in a statement Wednesday.

At least 750 migrants have been killed trying to cross Mexico since 2014, according to the organization, and thousands more have simply disappeared.

Thursday’s accident comes just a day after the United States relaunched a contentious migrant enforcement program known as Remain in Mexico, which would force asylum-seekers to wait across the border while their cases are determined in U.S. courts. The program has been criticized by human rights groups because of the unsafe conditions migrants face in Mexico.

“Under the Remain in Mexico program, the United States and Mexico have knowingly put thousands of asylum-seekers’ lives in danger,” Ari Sawyer, a researcher for Human Rights Watch, said in a statement Thursday.

This article originally appeared in The New York Times.

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