Pakistan's capital, Islamabad, is under lockdown for a second day as thousands of protesters demanding the release of former prime minister Imran Khan from jail converge on the city. His supporters are also calling for the overturning of election results they say were rigged - a claim disputed by the government.

At least one policeman was killed and dozens injured in clashes on Monday as thousands of the Pakistan Tehreek-e-Insaf protestors entered the territorial jurisdiction of the national capital on the call of the party founder Imran Khan.