Abdul Hadi Arwani was found dead in his car on Tuesday in London . Counter terrorism police were drafted in to lead investigation into death . A 46-year-old man has been arrested on suspicion of conspiracy to murder .
Abdul Hadi Arwani was found dead in his car on Tuesday in Wembley . Counter terrorism police were drafted in to lead investigation into death . A 46-year-old man has been arrested on suspicion of conspiracy to murder .