The team that investigated the former prime minister's assassination has prepared a 32-point questionnaire to send to Musharraf who is currently in the United Kingdom, Pakistan's Dawn News reported.
Director General Waseem Ahmed of the Federal Investigation Agency said the Bhutto case remains open even though the panel's has already submitted its report to an anti-terrorism court.
Sources in Pakistan's interior ministry told Dawn News the questions Musharraf is being asked relate to security lapses.
Investigators want to know why the former president did not provide fool-proof security for Bhutto after she narrowly escaped a bomb blast in Karachi two months earlier.
Bhutto's chief of security reportedly told the court adequate security arrangements could have averted the gun and bomb attack that killed her in Rawalpindi in December.