At least 20 people have been killed in a car bomb attack in the Colombian capital of Bogotá, police say.

Dozens more were injured in the blast which happened at 09:30 (14:30 GMT) on Thursday in the south of the city.

The car's driver, who was also killed, has been identified as a 57-year-old man. No group has said it was behind the explosion.

President Ivan Duque described it as a "crazy terrorist act" and declared three days of national mourning.
The grey Nissan Patrol entered the compound of the General Santander police academy where a promotion ceremony for cadets was being held.

When the car was stopped by guards at a checkpoint, the driver accelerated and hit a wall, at which point the car exploded.