BOGOTA, Colombia

At least 37 people were killed and more than a dozen injured Wednesday when a bus and a truck collided in the Brazilian state of Sao Paulo, according to a preliminary investigation by the Military Police of Sao Paulo. 

The bus, which had an upper floor, was carrying employees of a textile company from the western region of the state of Sao Paulo. Police are working on identifying the victims.

“There are people being treated in hospitals in the region and others are still trapped on the bus," said police spokesman Alexandre Guedes.

The town of Taguaí declared three days of mourning as a gesture of solidarity with victims and their families.

Police have not yet confirmed the cause of the accident.