A man has been arrested on suspicion of attempted arson and possession of an offensive weapon at an Essex mosque.
Police said the 43-year-old was held after officers were called to a prayer centre in Silks Way, Braintree, at 19:25 BST.
On his Twitter account, local MP Brooks Newmark said a man armed with knives and an incendiary device had "attacked" the mosque.
Police said the "full circumstances" were under investigation.
A spokesman for the Essex force said: "Police have arrested a 43-year-old man from Braintree following reports of a man in possession of a knife outside the prayer centre in Silks Way, Braintree.
"Police continue to investigate the full circumstances of the incident and as such it would not be appropriate to speculate at this time."
Mr Newmark, MP for Braintree, later removed his original tweet but added: "Just met with leaders of local mosque in Braintree which was attacked this evening. Thanked local police for their swift response."