Zardari's close aide Hussain Lawai was arrested in July 2018 in connection with the probe. His other close aide and Omni Group chairman Anwar Majeed and his son Abdul Ghani Majeed were arrested in August 2018.
The FIA issued notices yesterday to the former president and his sister to appear at the agency's headquarters in Islamabad tomorrow. This is the fourth time they have been summoned, Dawn newspaper reported.
Chief Justice Saqib Nisar ordered the names of 20 people, including Zardari and his sister Faryaz Talpur, be placed on the Exit Control List, Geo TV reported. Those persons on the list are prohibited from leaving Pakistan.
"The Sharif brothers - former prime minister Nawaz Sharif and his younger brother Punjab Chief Minister Shahbaz Sharif -twice planned my murder in captivity in 1990s," Zardari said while speaking to party workers at Bilawal House Lahore on Saturday.
Asif Ali Zardari, 62, the co-chairperson Pakistan Peoples Party (PPP), said: "Me and Benazir were blamed (by Musharraf) for Murtaza Bhutto's murder. History is full of such accusations", the Express Tribune reported.
The 54-year-old Pakistan Peoples Party (PPP) chief and a two-time prime minister was killed along with more than 20 people in a gun and bomb attack in Rawalpindi's Liaquat Bagh during an election campaign rally on December 27, 2007.