Two more British investigators on Wednesday joined the Scotland Yard team in Pakistan to probe the assassination of former premier Benazir Bhutto.
A five-member team from Metropolitan Police's Counter-Terrorism Command had arrived here on January four to investigate the killing of Bhutto in a suicide attack after her election rally in Rawalpindi on December 27.
Sources said the two investigators who arrived today on a British Airways flight were specialists in questioning and interviewing people.
The other members of the Scotland Yard team are forensic and technical experts.
Since its arrival, the team has reconstructed the assassination of Bhutto at the historic Liaquat Bagh ground in Rawalpindi and questioned eyewitnesses and persons who were injured in the attack.
They have inspected Bhutto's bomb-damaged armoured vehicle and body parts of the victims in a mortuary in Rawalpindi.
They have also interviewed the doctors who treated Bhutto in Rawalpindi General Hospital.
President Pervez Musharraf, who requested British Prime Minister Gordon Brown to send the Scotland Yard team, has urged it to get to the "bottom of the issue" in its investigation.