Police remained at the scene of a city centre demolition site this morning after a wall and scaffolding collapsed, causing major disruption.

Part of a wall at the site of the former Thompson Mill, in Tetley Street, Bradford, which was destroyed by fire last October, collapsed yesterday, bringing down scaffolding along with it.

The emergency services were called to the site at about 6.30pm after the wall and scaffolding came down.

Mark Rogerson, watch commander at Bradford fire station, said crews used thermal imaging cameras and a sniffer dog to make sure there was nobody trapped under the rubble.

He said: “The building itself is down, but they left up the external walls which go around the outside of the site and around the outside of that was the scaffolding which they had been using.”

Mr Rogerson said it was not yet known what caused the 20ft by 40ft section of the wall to collapse.

A West Yorkshire Police spokesman said a nearby window was smashed by a piece of the scaffolding, which was about three floors high.