The Express Tribune quoted Bilawal as saying in an interview with a British media outlet that some important details about his mother Benazir Bhutto's assassination are not being disclosed in order to protect Musharraf.
"I personally hold Pervez Musharraf responsible for the assassination of my mother," he added.
The PPP chairman further stated Musharraf took advantage of the situation to get rid of his mother.
"The PPP does not regard the young man who killed Benazir in a bomb and gun attack on her vehicle in 2007 as her murderer. In reality, Pervez Musharraf killed my mother by taking advantage of the situation," Bilawal said.
"The terrorist did shoot the bullet from which my mother was killed, but the former president removed my mother's security protocol on purpose so she would be an easy target," he added.
Geo News had quoted Rabbani as saying that Musharraf should return to Pakistan and face cases against him if he is a brave man.
He had added that Musharraf was enjoying his life sitting in London and Dubai.
Today is the 10th death anniversary of Benazir Bhutto.
She was the daughter of Zulfikar Ali Bhutto, Pakistan's first democratically elected prime minister.
Benazir went on to become prime minister twice in the 1990s, but she was always distrusted by the military, which used corruption allegations to remove her from power. At the time of her death, she was making a bid for a third term as prime minister in 2007. The assassination had caused widespread civil unrest in Pakistan. (ANI)