At least 10 people were killed and more than 50 injured Monday when a freight train struck and split a double-decker bus carrying domestic and construction workers near Atlacomulco, about 80 miles (130 kilometers) northwest of Mexico City, authorities and witnesses said.

Videos shared after the crash show the bus crossing the tracks as bumper-to-bumper traffic crept through an industrial area and the train’s horn sounded shortly before impact. Survivors were pulled from the wreckage and rushed to hospitals across the State of Mexico, and relatives gathered outside emergency rooms searching for news of loved ones.

Hospital staff called out names over a megaphone as stretchers were moved and ambulances prepared to transfer badly injured people to other facilities. Some families set up tents outside hospitals for a long night of waiting. Witnesses said women cried at the entrance of the medical facility while others searched for information about relatives who had been aboard the bus.

Isabel Segundo, 38, said she spent hours calling to find her 17-year-old daughter, a domestic worker who commuted daily to Mexico City. She said she feared the worst until learning late Monday that her daughter had survived. Rebeca Miranda said her sister was injured and taken to a hospital while her sister’s daughter-in-law was killed in the crash.

Witnesses described a crossing marked only by a stop sign and a deteriorated railroad-crossing sign, with no protective gates or warning lights. Miguel Sánchez, who was about 100 yards (meters) from the scene at a nearby gas station, said he heard the train horn as he began his shift and was stunned by the magnitude of the crash.

"We thought it was just a car. We never thought it would be a bus with so many people aboard," Sánchez said.

The collision left halves of the double-decker bus on either side of the tracks. Video and reports described passengers moving on the bus’s second floor as the train slowed after the impact. Clothing and personal items were scattered throughout the vehicle.

Herradura de Plata, the bus operator, issued a statement saying it was cooperating with authorities and providing "medical, psychological, legal and logistical" support to those affected and that it "deeply regrets" the accident. The train operator Canadian Pacific Kansas City of Mexico urged drivers to respect signage and to make a full stop at railroad crossings to avoid accidents.

Mexico’s Rail Transportation Regulating Agency did not immediately respond to requests for comment on the crash. Authorities have opened an investigation into the causes of the collision.

Rail crossing accidents have been a growing problem in Mexico in recent years. A regulatory agency report published in September said that accidents at grade-level crossings are the most common and have increased, citing 800 accidents in the most recent year compared with 602 in 2020. Separately, authorities noted other recent deadly incidents: last month a train struck several vehicles in Guanajuato state, killing six people, and in 2019 a freight train hit a passenger bus in Querétaro, killing nine.

Relatives of victims pressed for answers about responsibility and compensation. Alberto Maximino de Jesús, 50, was returning to Mexico City for work when the train hit; his wife, Florencia de Jesús Sabino, said he called immediately after the crash and that he told her, "We had an accident, a train ran us over." She said he was in stable condition late Monday and questioned who would cover damages for their family. "He’s the main provider for our family," she said.

Local emergency services continued to treat the injured and coordinate transfers to other hospitals. Officials did not provide a full list of the dead and injured as efforts continued to identify victims and notify families. The investigation will examine the circumstances at the crossing, the bus’s actions, and the train’s approach to determine what led to the collision.