Grimsby MP Austin Mitchell said attacks on mosques and other Islamic institutions were playing into the hands of terrorists who wanted community conflict.
Mr Mitchell told BBC Radio Humberside: "It's sheer, simple stupidity. I'm appalled and shocked. I didn't expect this in Grimsby.
These idiots, whoever they are, are playing directly into the hand of the terrorists.
More top news
Manchester United want Renato Sanches and Everton slap £50m price tag on Ross Barkley with Spurs interested.
Shoppers who don't bring their own bag will need to buy a bag for life costing 8p or 10p.
Temperatures will reach around 28 Celsius (82F) at their highest.