Widespread unrest across Pakistan as Benazir Bhutto's party challenge government's version of the cause of her death.

Officials claim Benazir Bhutto died after hitting her head on the sun roof of her car. But her party has accused the government of trying to cover up failures to protect her so close to planned elections. Al Qaeda linked militants have denied being behind the killing of the 54 year old former prime minister. Pakistan's government had said it had proof of their involvement. Violence has spread across the country while doubt has been thrown on whether January's planned election can now go ahead.

--Reuters.

Duration: 1 min 40 sec