The official death toll from the accident involving a commuter train and a bus in the Argentine capital has risen to 11 people with 228 others injured, officials said.

Seven people were pronounced dead at the scene on Tuesday, while four others died at nearby hospitals. Authorities had said shortly after the accident that most of the dead had been riding on the bus.

Among the injured, at least 20 were listed in serious condition and remain hospitalized, the director of emergency medical services, Alberto Crescenti, said.

The accident occurred early Tuesday, just a few meters (yards) from the Flores station, when a train heading from Buenos Aires to the metropolis' western outskirts collided with a packed bus that failed to stop at a crossing gate, security camera footage showed.

The battered bus was carried along by the train, which then derailed and crashed into another train that was parked at the station, authorities said.

The injured - including the train's conductor, who suffered leg fractures but is reportedly out of danger - received treatment at a half-dozen hospitals in the capital.

Some people on the station platform also suffered injuries.

The bus, whose driver perished in the accident, "went through the level crossing when the barriers were down, but we're going to wait for the results of the investigation and the recordings to determine if that's what happened," Trenes de Buenos Aires spokesman Gustavo Gago said.

The level crossing barrier was operating normally, Transportation Secretary Juan Pablo Schiavi said in response to statements to the contrary by eyewitnesses.

Different media outlets broadcast footage from one of the security cameras that shows the barrier was at 45 degrees and that the bus passed slowly over the level crossing until being struck by the train.

The collision was the fifth serious accident involving a train in Argentina in the past nine months.

The accident occurred during rush hour and temporarily shut down service on the busy Sarmiento commuter line, which carries roughly 700,000 passengers a month.