Two men are due in court charged with arson with intent to endanger life after a Grimsby mosque was petrol-bombed.
Grimsby Islamic Cultural Centre was attacked for the second time in three days while a young family was inside on Sunday.
Stuart Harness, 33, of Grimsby, and Gavin Humphries, 37, whose address has not been specified, were arrested in connection with the incident and will appear at Grimsby Magistrates' Court on Tuesday morning.
The petrol-bombing was the second time the centre on Weelsby Road has been targeted since Drummer Lee Rigby was killed in Woolwich last week.
Eleven teenagers, aged 16 and 17, were arrested after a party spiralled out of control on Thursday.
Chief Superintendent Tony Forbes, of Humberside Police, said: "It is important to remember that those people who have committed these offences are a very small minority and they do not reflect the vast majority of people who live in North East Lincolnshire."
Humberside Police said it is investigating whether the incidents are racially motivated.