On Sunday around 4:00 PM, a charter bus carrying students from various Buenos Aires dance schools crashed and flipped on Route 144 in San Rafael, a city located in the province of Mendoza. At least 15 people were killed, 23 are wounded, with reports that the remaining passengers have all been discharged from the hospital. In total, there were 52 passengers and two drivers, according to Emir Felix, mayor of San Rafael.

Only 13 bodies have been identified given that most of the dance students did not carry their documentation on their bodies but instead in their luggage.

In addition to the passenger deaths, the driver died as a result of the impact. The firefighters working in the area speculate that there could be more bodies under the bus’ debris. They are awaiting a crane that will move the vehicle to confirm.

To add to the tragedy, the bus was not legally cleared to drive, according to the National Commission for Transport Regulation (CNRT). The agency announced that it will sue the bus company. The vehicle registration expired on December 12, 2016; however, the driver’s license was valid at the time of the accident.

A “crisis protocol” was released to assist relatives of the dancers with the Ministry of Social Development of the Nation.

Following the crash, President Mauricio Macri sent his condolences out to all families affected via Twitter.