Khan said these revelations had repeatedly exposed what he had been saying in his '24-year fight against corruption which is the biggest threat to the country's progress'.
A massive power blackout was reported in Pakistan before midnight on Saturday, which plunged several cities into darkness, reported Pakistan daily.
Sharif, 70, the PML-N supremo, has been living in London since November 2019 after the Lahore High Court granted him permission to go abroad for four weeks on pretext of medical treatment.
The Pakistan government has already approached United Kingdom authorities to extradite Nawaz Sharif.
Sharif's seized house in Murree is registered in the name of his late wife Begum Kulsoom Nawaz, the application stated, adding it was purchased before the date mentioned in the reference.
In 2018, accountability court Judge Mohammad Arshad Malik had convicted Nawaz in the Al-Azizia Steel Mills Company (ASCL) and Hill Metal Establishment (HME) reference.
Her remarks came in response to Prime Minister Khan's recent disclosure that he was aware that the agencies tap his phone calls.
Sharif, who in the past has undergone heart surgery, visited consultants on Harley Street on Tuesday and Wednesday and is scheduled for more scans on Thursday, according to the report.
National Accountability Bureau alleged that RehmanMir Shakilur Rehman was given 54 plots of land in Lahore's Jauhar Town phase-II by then Punjab CM Sharif in 1986 in violation of the relevant laws.
Nawaz Sharif attacks Pakistan Army, ISI chief as Opposition says 'sun about to set' on Imran Khan govt
The Pakistan Democratic Movement (PDM), a coalition of 11 Opposition parties, was formed to oust Khan from power on September 20.
For over nearly a month, the Pakistan government has made several attempts to get Sharif's arrest warrant signed
His daughter Maryam was sentenced to seven years in prison for abetment and his son-in-law Captain (retd) Mohammad Safdar to one year.
Sharif had submitted an undertaking to the court that he would return within four weeks or as soon as he was declared healthy and fit to travel by doctors.
Pakistan's Opposition parties have alleged that paramilitary Frontier Corps reportedly pressurised Sindh Police to arrest Safdar.
Maryam's husband Capt (retd) Mohammad Safdar was earlier arrested in Karachi for allegedly violating the sanctity of Quaid-e-Azam mausoleum.