Humberside Police have said they are considering the possibility that the "mosque was targeted for racial reasons," but stressed that it would not be fair to speculate on this at present.
They said there was was "no suggestion" of a link between two separate offences - a fire at the mosque last night, and reports of youths damaging the building on Thursday.
More top news
Charlie Gard's parents are embroiled in a fresh High Court battle over whether the terminally ill baby can spend his final days at home.
The rogue surgeon was previously convicted of deliberately wounding his patients and carrying out needless operations.
A fine and warm day, but turning wet and windy tomorrow