Man , 61 , arrested on suspicion of conspiracy to murder Abdul Hadi ##yya . Syrian imam was found shot dead in his car on a street in Wembley . Leslie Cooper , 61 , has already appeared in court accused of murder . Burnell Mitchell , 61 , and a year - old woman were also arrested on suspicion of terror attacks .
Man , 36 , arrested on suspicion of conspiracy to murder Abdul Hadi Arwani . Syrian imam was found shot dead in his car on a street in Wembley . Leslie Cooper , 36 , has already appeared in court accused of murder . Burnell Mitchell , 61 , and a 53-year-old woman were also arrested on suspicion of terror offences .