The bus was part of a convoy of three carrying border patrol officers
A bus carrying police officers has crashed into a ravine in the north of Argentina, killing at least 41 people.
The accident happened early Monday morning near Salta, a city situated around 932 miles north of Buenos Aires.
The bus, part of a convoy of three carrying border patrol officers, plunged around 65ft into a dry riverbed after the driver lost control on a bridge, police said.
Authorities said there were about 60 people on the bus, as rescue workers attempted to free those trapped in the overturned bus and survivors were taken to hospital.
"For reasons that are still unknown, the bus lost control while entering the bridge and fell into the creek bed below," the National Gendarmerie - border police- said in a statement.
The officers were being driven to the province of Jujuy, which borders Bolivia.
Gustavo Solis, mayor of a town called Rosario de la Frontera, in Salta, said the road is known to be in bad condition and is avoided by locals, especially at night.
Police said visibility was good at the time of the accident so they were not ruling out mechanical failure as a cause.
President Mauricio Macri sent his condolences to the families of the victims.
"We need to improve our highways so these things don't keep happening," he said.
Security Minister Patricia Bullrich and National Gendarmerie director Omar Ariel Kannemann were said to be heading to the scene.