Thousands of protesters calling for the release of Pakistan's jailed ex-prime minister Imran Khan defied roadblocks and tear gas to march to the

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.