BUENOS AIRES, Argentina (AP) - The death toll in Argentina's train accident is up to 50, including three children.

Buenos Aires officials said Thursday that the bodies of seven men and five women remain unidentified in the city morgue.

Wednesday's hard stop of a commuter train at a downtown station also left nearly 500 people hospitalized, sending families on desperate searches around the Argentine capital to find their loved ones.

The cause of Argentina's deadliest train accident in decades is under investigation, but many are blaming outdated and poorly maintained equipment.

The government has declared two days of official mourning, with flags flying at half-staff.