Authorities in Pakistan sealed off the capital, Islamabad, and blocked cellphone services on Friday to prevent an anti-government rally by supporters of jailed former Prime Minister Imran Khan, officials said.

Pakistan authorities have sealed off Islamabad and suspended cellphone services to prevent protests by supporters of jailed former PM Khan.

Pakistani authorities on Friday deployed the army in the capital for two weeks as violent protesters who support jailed former prime minister Imran Khan clashed with police after they were blocked from entering the city.

Former Pakistan Prime Minister Imran Khan's two sisters, Aleema Khan and Uzma Khan, reached Islamabad's D Chowk for a "peaceful protest" and were arrested by police.

Police in Pakistan's capital fired teargas on Friday as they clashed with supporters of jailed former prime minister Imran Khan who were holding an anti-government rally in defiance of a ban on congregating in the city.