In an interview with the Telegraph, William Shawcross, the Commission’s chairman, warned that extremism was “the most potentially dangerous and deadly” problem faced by charities.

He said: “It is the most dangerous because of the threat of Islamist extremism. It is not the most constant threat – it is the most potentially deadly threat.”

The 630 disclosures, which Commission sources said was a record figure, concerned “allegations made and concerns about abuse of charities for terrorist or extremist purposes, including concerns about charities operating in Syria and other higher risk areas, in which terrorist groups operate”.

Mr Shawcross called for Muslim charities to work with the regulator to tackle the threat of extremists taking them over to further their murderous objectives.

He said that it was in the interests of the Muslim community to crack down on the problem because of the risk they could be caught up in a terrorist incident like the murder of Drummer Lee Rigby outside Woolwich barracks in south-east London in 2013.