A man has been arrested in connection with alleged incidents of assault at a mosque in Keighley.
Police said it followed the release of secret footage filmed at the Markazi Jamia Mosque, due to be aired on the Channel 4 Dispatches programme tonight.
The footage from the programme includes children apparently being hit by a teacher.
Police said the man had been bailed and they were "receiving co-operation from the Keighley Muslim Association".
Some of the programme also features footage of a school in Birmingham.
It was viewed by detectives after some of the footage was posted on the internet.
A West Yorkshire Police statement said: "We have recently become aware of a number of incidents of alleged assault at a mosque in the Keighley area and just before the weekend we were able to view edited footage of the alleged incident.
"One man has been arrested in connection with the incidents and has been released on police bail pending further enquiries.
"West Yorkshire Police are receiving full co-operation from the Keighley Muslim Association who are working with us in support of the inquiry."