At least 16 people were killed and 21 injured after the carriage of a funicular – a type of railway that travels up and down steep slopes – derailed in the Portuguese capital of Lisbon on Wednesday evening.

Authorities are still investigating exactly what caused the disaster, which has left the city in shock and the nation in three days of mourning.

Here’s what we know about the tragedy so far:

What do we know about the incident?

The historic Gloria funicular crashed just after 6 p.m. on Wednesday evening local time (1 p.m. ET), according to CNN’s affiliate CNN Portugal.

Eyewitnesses reported seeing one of the railway’s two cars derailing and careening down the street before hitting a building. One man, whose first name is Bruno, told CNN Portugal that the funicular car was “complet

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