Officers from Britain's Scotland Yard arrived in Pakistan Friday to help the country's authorities investigate the assassination of former prime minister Benazir Bhutto.

A member of Scotland Yard arrives at Islamabad International Airport on Friday. ((Warrick Page/Getty Images))

The small team from the Metropolitan Police's Counter-Terrorism Command will meet officials from Pakistan's Interior Ministry later in the day, the CBC's Stephen Puddicombe reported from the capital, Islamabad.

The move comes a day after President Pervez Musharraf acknowledged his investigators need help and said he was "not fully satisfied" with Pakistan's own probe into Bhutto's death.

During a press conference Thursday, Musharraf said his request for Scotland Yard to help local police with the investigation was intended to dispel any suspicions about the involvement of government officials.

Pakistan's government has been criticized over its security arrangements for Bhutto, who was killed Dec. 27 in a gun and suicide bombing attack following an appearance at a campaign rally in Rawalpindi.

Bhutto, who twice served as prime minister, had said elements in the ruling party and the country's security forces were trying to kill her.

Key evidence already secured: British official

It remains unclear whether Bhutto — who rose from the sunroof of her vehicle to wave to supporters moments before shots were fired and a bomb went off — was killed by the gunfire or died from striking her head as she fell back into the vehicle, as the government claims.

Musharraf said there was no security lapse, and implied Bhutto was partly responsible for her own death.

"Who is to be blamed for her coming out of her vehicle?" he asked.

Pakistan provided Bhutto with protection and warned her she faced threats if she returned to her home country after eight years of self-imposed exile, said Musharraf.

Bhutto's Pakistan Peoples Party is calling for the United Nations to investigate her death, saying "vague" help from Scotland Yard is not enough to reveal the truth.

A senior police investigator, who spoke on condition of anonymity to the Associated Press because of the sensitivity of the investigation, said Thursday that police in Pakistan already had secured key evidence, including the suspected bomber's remains, two pistols and mobile phones.

Scotland Yard investigators, with their superior forensic techniques, could help determine whether either pistol was fired in the attack and also could examine video, he said.