The joint investigation team (JIT), set up to examine the business dealings of the Sharif family overseas, on Monday told the Supreme Court (SC) that not only have some governmental departments shown reluctance in handing over relevant records, but some records have also been tampered with, DawnNews reported.
According to the summons document, seen by Reuters, JIT asked the Prime Minister's office to bring "all relevant record/documents/material" to the interview at its office in the capital, Islamabad on Thursday.
The team has already questioned the prime minister's sons several times. Sources said the development was conveyed to the prime minister when he returned from Kazakhstan on Saturday where he had been attending the Shanghai Cooperation Organisation (SCO) summit.
He said that the prime minister has always come forward for the accountability and exhibited respect for the law, believing in the supremacy and rule of law.
Sharif, who is now in Lahore, met with his close confidantes Sunday morning to discuss the issue.
Former Interior Minister Senator Rehman Malik has been summoned by the Joint Investigation Team on Tuesday.
"Yes, the government has received a letter by the Joint Investigation Team in which he has been directed to appear before this committee and he will appear in front of them", Information Minister Marriyum Aurangzeb said late on June 11.
Pakistan's Supreme Court in April ordered a joint investigation team of anti-corruption officials, along with the powerful Inter-Services Intelligence and Military Intelligence, to probe the claims and issue a report within 60 days.
The court past year took up the case and issued a split decision over allegations of money laundering when Sharif was prime minister in 1990s.
After the leak of the "Panama Papers", opposition parties including sporting hero Imran Khan's Pakistan Tehreek-e-Insaf filed a petition with the court seeking Sharif's disqualification on the grounds that the assets held overseas were acquired with tainted and laundered money.
The six-member JIT had also prepared an inquiry report on the Hussain Nawaz photo leak, which was submitted to the bench.
It is for the first time that a sitting prime minister would appear before a high-level probe team traditionally constituted to investigate high-profile criminal cases.