An unexploded bomb from World War Two has been found very close to Borussia Dortmund's stadium - and the area around the venue has been evacuated.

Authorities in Germany say the bomb was British and would be disarmed later today.

It was discovered on a building site next to the Westfalenstadion.

A news conference with boss Jurgen Klopp had to be relocated.

Pressekonferenz vor dem Derby: Läuft! #bvbs04 pic.twitter.com/EqozMccL1t

— Borussia Dortmund (@BVB) February 26, 2015