Supporters of Imran Khan were planning to march to Islamabad on Wednesday where the former Pakistan prime minister is in custody in a corruption case, raising fears of more clashes with security forces.
Khan was arrested from the Islamabad High Court on Tuesday by Pakistan's anti-corruption agency. Police said a court hearing would take place at the police guest house where he is being held.
The arrest came a day after the country's powerful military rebuked Khan for repeatedly accusing a senior military officer of trying to engineer his assassination and the former armed forces chief of being behind his removal from power last year.
In response, his Pakistan Tehreek-e-Insaf party called for a "shut down" across the country, with Khan's supporters clashing with police in many cities and storming military buildings in Lahore and Rawalpindi, according to witnesses and videos shared by his party.
Supporters in northwestern Khyber Pakhtunkhwa province were asked to gather early on Wednesday in Swabi city to leave for Islamabad as part of a convoy, the party wrote on Twitter.
Party leaders asked workers to continue protests but not take the "law in their hands", according to messages shared on Twitter on Wednesday.
A police spokesman told Reuters on Wednesday that Khan will not be brought to court and his scheduled hearing will take place at the location where he is being held under custody.
US Central Command said it completed its 11th consecutive day of strikes on Iran, targeting Iranian military operations centres, maritime capabilities, aircraft hangars, drone storage facilities, and military logistics infrastructure.
Indian opposition lawmakers disrupted parliament on Wednesday in support of student protesters, echoing their calls for the education minister to resign over exam leaks and ratcheting up pressure on Prime Minister Narendra Modi after days of unrest.
US Secretary of State Marco Rubio said on Wednesday the United States is still willing to negotiate an end to the Iran crisis but Tehran is not serious about talks, as the widening conflict disrupted two of the world's most critical energy chokepoints.
The new commander-in-chief of Ukraine's armed forces, Mykhailo Drapatyi, said on Wednesday he had been tasked with stepping up counteroffensive actions and launching new operations inside Russia.