Islamabad, Dec 27: Pakistan Peoples Party (PPP) Chairman Bilawal Bhutto Zardari has held former military dictator Pervez Musharraf persolly responsible for the murder of his mother, Bezir Bhutto, as the country observed her 10th death anniversary on Wednesday. Bhutto, the PPP chief and a two-time Prime Minister, was killed along with 21 people in a gun-and-bomb attack outside Rawalpindi’s Liaquat Bagh during an election campaign rally on December 27, 2007.