London, England (CNN) -- A 34-year-old man has been arrrested on suspicion of murder in the September slaying of a Pakistani politician outside his home, London Metropolitan Police said Thursday.
Imran Farooq, 50, suffered stab wounds and head injuries when he was returning home from work on September 16, police said. He lived in Edgware.
The unidentified suspect, who was arrested in Camden, also was arrested on suspicion of robbery in an October 2009 incident, Scotland Yard said in a statement. He was being questioned by detectives.
Farooq was a prominent member of the Muttahida Quami Movement (MQM), a part of the coalition government led by President Asif Ali Zardari's Pakistan People's Party in Pakistan's central and southern Sindh province. The party is liberal, with a stronghold in Karachi.
Mohammad Anwar, a member of MQM's Central Coordination Committee, said Farooq led the committee, which is the party's highest decision-making body. Farooq also led international relations and human rights affairs for MQM, Anwar said in September.
Farooq moved to London in September 1992 after concluding his "life and liberty were at risk back home," Anwar said.
The killing sparked violent clashes between the MQM and members of the Awami National Party (ANP), Pakistan police said in September.
London detectives said they want to talk to two other men in connection with Farooq's death.