Since being removed from power, the former prime minister has heaped pressure on Pakistan's new government by staging protest rallies, reiterating a claim he was ousted in a "foreign conspiracy".
Pakistan deploys military "to protect" important facilities in Islamabad's red zone area, as ousted PM Imran Khan gathers thousands of his supporters for a major anti-government rally.
All entry and exit points on key highways leading to the Pakistan's capital have been blocked by police as Prime Minister Shehbaz Sharif pledges to stop opposition leader Imran Khan's planned protest.
Khan has been demanding early elections and claiming his removal from office was the result of a US-organised plot.
The police operation was an attempt to foil a planned protest seeking to force Pakistan's new government into calling early elections, the Pakistan Tehreek-e-Insaf party has claimed.
Police operation began just after midnight and officers were still raiding the houses of supporters late in the day, says Fawad Chaudhry, a spokesperson for Khan's Tehreek-e-Insaf party.
Since his ouster in April, ex-PM Imran Khan has addressed rallies in several Pakistani cities calling for fresh elections.
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.
Pakistan PM Shehbaz Sharif appoints Bilawal Bhutto Zardari, son of assassinated former premier Benazir Bhutto, as foreign minister, giving his coalition ally a senior role in repairing frayed ties with US and other countries.
Ousted PM warns he will bring his supporters to capital Islamabad as he hosts third massive public gathering since losing power to ratchet up pressure on new Shehbaz Sharif government.
Forum of civil and military leaders did not endorse ousted PM's claim of an American conspiracy to unseat him, Pakistani army says, but insists a demarche was given to US for "undiplomatic language" and "interference."
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.
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