An emergency has been declared in Colombia after a plane carrying members of a Brazilian football team crashed with 81 on board.

The plane is believed to have come down in a mountainous area outside Medellin shortly before midnight local time. Some survivors have been reported. The first division side was preparing to play on Wednesday in the first of a two-leg Copa Sudamericana final against Medellin’s Atletico Nacional.

Medellin’s airport said the plane, which had stopped in Bolivia, had been carrying the Chapecoense soccer team from southern Brazil. It is not yet clear what caused the aircraft – a British Aerospace 146 – to come down, but Colombia has been experiencing heavy rain and thunderstorms.