Supporters of Khan clashed with police overnight as he remained holed up in his Lahore residence, defying attempts to arrest him.
Multiple explosions and continuous firing were heard as armed men attacked a police station in in Pakistan's port city Karachi.
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.
Release of 524 Afghan nationals, including women and children, in Karachi comes a month after a mass detention by police.
Only an adequate green cover can save humanity and the planet from the effects of climate crisis-induced heating, floods, and other weather extremes.
Thousands of Khan's supporters take to streets to protest what his aides and the country's president say was "a clear assassination attempt" by his rivals.
The United Nations has warned of a "second disaster" in Pakistan from diseases such as dengue, malaria, cholera and diarrhoea, as well as from malnutrition.
With floodwaters engulfing the Dadu district of Pakistan's southern Sindh province, residents are left with only one passage to leave the city.
A third of the country is under water — an area the size of the United Kingdom — following record rains brought by what Guterres has described as "a monsoon on steroids".
Toll rises with 57 more deaths, 25 among them children, and officials say floods inundating a third of the South Asian country were preceded by four heatwaves and multiple raging forest fires provoked by climate crisis.
Doctors say the number of people suffering from diarrhoea, skin infections and other waterborne ailments is rising in the country's flood-hit areas.
UN Secretary-General Guterres says Pakistan’s flooding is a signal to the world to step up action against the climate crisis, while Türkiye sends more planes carrying relief supplies to Karachi.
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