Turkey has arrested more than 1,000 alleged Islamists who secretly infiltrated the Turkish police on the orders of a cleric the government blames for last year’s failed coup attempt, authorities said.

The Turkish interior ministry said it had arrested 1,009 members of the Gulen movement, an Islamist group that President Recep Tayyip Erdogan accuses of being behind the coup against him last July.

The movement is led by Fethullah Gulen, a Turkish cleric who is living in exile in the US and was once an ally of Mr Erdogan’s before becoming a bitter rival.