Several people have died after a crash between two trains during the morning rush hour in the Argentine capital Buenos Aires, officials say.
Firefighters and police are pulling passengers from the wreckage, and helicopters are taking people to hospital.
A double-decker train slammed into another that had stopped between stations.
Train operator spokesman Pablo Gunning says there are "various fatalities" though he did not say how many.
Union leader Ruben Sobrero told reporters at the scene that the double-decker train had been out of service for six months before it was brought back online shortly before the acccident. Mr Gunning said the engine had new brakes installed.
The accident happened on the same Sarmiento line that the government took over after another crash blamed on brake failures caused 51 deaths and 700 injuries last year.