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
UK airport passengers have to walk up to a kilometer from check-in desks to reach their departure gates, new research has shown.
In an annual survey taken among local authorities in the UK, 2,463 stray dogs were put to sleep between April 2015 and March 2016.
Inspectors found the availability of drugs at HMP Bedford was having a "serious impact" on safety.