LAHORE: Prime Minister Nawaz Sharif's return to Islamabad has been delayed due to fever and infection, a PM House spokesman said Monday.

The premier, who is currently in Lahore, "was due to travel to Islamabad tomorrow (Tuesday) morning but due to an infection in one of his leg incisions, he is suffering from fever," the spokesperson said.

The spokesperson added that doctors are treating the prime minister's infection and Nawaz Sharif will travel to Islamabad as soon as his fever subsides.

Nawaz arrived in Pakistan last Tuesday after undergoing open-heart surgery at a London hospital on May 31.

The need for the surgery arose after the premier went through a cardiac procedure called Atrial Fibrillation Ablation in 2011, "during which certain complications occurred resulting in perforation of heart", Maryam Nawaz earlier told the media.

Many had called it a politically imprudent decision to leave the country at a time when opposition parties were exerting pressure on the government in the wake of the Panama leaks. However, a PML-N officer-bearer had told Dawn that Nawaz's medical condition necessitated the visit.

Pakistan Tehreek-i-Insaf (PTI) secretary general Jahangir Khan Tareen last week said the party’s preparations for launching a "massive protest movement" over the Panama leaks soon after Eidul Fitr were in full swing.

An investigation published April 3 by an international coalition of more than 100 media outlets ─ based on 11.5 million records and 2.6 terabytes of information drawn from the internal database of Panama law firm Mossack Fonseca ─ details how politicians, celebrities and other famous people use banks, law firms and offshore shell companies to hide their assets.

According to documents available on the ICIJ website, the Prime Minister Nawaz Sharif's children Maryam, Hasan and Hussain "were owners or had the right to authorise transactions for several companies".

The data leak revealed the financial wheelings and dealings of over 200 Pakistanis, including the late Benazir Bhutto, Rehman Malik and other prominent politicians and businessmen.