Fourth arrest over preacher murder
A fourth person has been arrested in connection with the death of Syrian-born preacher Abdul Hadi Arwani.
Metropolitan Police said a 36-year-old man was arrested by detectives on Friday on suspicion of conspiracy to murder.
His arrest was only made public today, upon his release on bail.
Mr 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 on April 7 in the Greenhill area of north-west London.
One man, Leslie Cooper, 36, 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.