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
Wet weather to end the weekend.
The widower of murdered MP Jo Cox has quit two charities set up in her memory after sexual assault allegations from his past resurfaced.
A cold and frosty night so a freezing start for those up bright and early.