According to the source, the bus slammed into an object at around 9.50 am, injuring nine people, at least two seriously.

Asked about the condition of the injured people, the source said, "Apparently two are serious, but operations are still ongoing."

Two medical vehicles, two INEM ambulances and five others of the volunteer firefighters of Lisbon, Lisbonenses, Sapadores and the Cabo Ruivo and Beato firefighters are at the scene.