Brigadier Mustafa Kamal Barki of powerful Inter-Services Intelligence, the nuclear-armed nation's main spy agency, was killed and seven others of his team were wounded in an encounter with militants, Pakistani military says.
Supporters of Khan clashed with police overnight as he remained holed up in his Lahore residence, defying attempts to arrest him.
At least 100 killed and 221 injured when suicide bomber hit a mosque inside police headquarters in Peshawar.
The bomber carried out the attack during afternoon prayers when the mosque was packed with worshipers and most of the victims were reportedly police officers from a nearby station.
The port city of Karachi, with a population of more than 15 million, and Lahore, with population of more than 10 million, remained without power due to a fault in the national grid.
The attack comes two days after a similar incident in country's northern Khyber district killed three police officers.
Terrorists attacked a police station in Peshawar, the capital of northwestern Khyber Pakhtunkhwa province of Pakistan which has seen a rise in terror attacks launched by outlawed Tehrik-i-Taliban Pakistan in recent months.
The former prime minister mentioned the alleged plot against him in a speech in the city of Sialkot and claimed he had recorded a video message detailing it all.
Washington congratulates new PM Shehbaz Sharif, saying "we look forward to continuing our long-standing cooperation with Pakistan," while opposition chief Imran Khan repeats conspiracy claims before charged supporters in northern Peshawar city.
Huge rallies held in cities across the South Asian country in favour of ex-premier and against "foreign interference", a day after Khan's removal in a parliamentary no-trust vote.
Drug control has been a major demand of the international community of the Taliban, which is seeking formal international recognition to wind back sanctions.
"The court has asked PTA to block access to TikTok," Pakistan Telecom Authority spokesperson Khurram Mehran says.
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