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20 April 2015, 11:50 | Updated: 20 April 2015, 11:52
A fourth person has been arrested in connection with the death of Syrian-born preacher in north London.
Metropolitan Police said a 36-year-old man was arrested by detectives on Friday on suspicion of conspiracy to murder.
He has been released on bail.
Abdul Hadi Arwani was a critic of the Assad regime in Syria and an imam at the An Noor mosque from 2005 to 2011.
He was found dead in a car with gunshot wounds in Wembley on 7 April.
A 36 year-old man has appeared in court charged with Mr Arwani's murder.
A 61-year-old man was arrested on Tuesday on suspicion of conspiracy to murder and further arrested on Wednesday on suspicion of the commission, preparation and instigation of acts of terrorism.
A 53-year-old woman was arrested on Wednesday on suspicion of the commission, preparation and instigation of acts of terrorism.
Both remain in police custody.
Detectives from the Met's Counter Terrorism Command continue to investigate.