LAHORE: Opposition politician Imran Khan has vowed to continue his protest against Pakistani Prime Minister Nawaz Sharif until the leader resigns over allegations of election rigging.Khan, along with populist cleric Tahir-ul-Qadri, has been staging a sit-in in capital Islamabad since August 15.Last week he took his protest to Pakistan’s largest city Karachi and on Sunday he addressed thousands of people in his home town and Pakistan’s second largest city — Lahore, which is also the home town of Sharif.“The Pakistan nation has woken up against injustice and tyranny and I will continue this protest in other cities till Nawaz Sharif resigns,” Khan said.The supporters of Khan’s Pakistan Tehreek-e-Insaf (PTI) party carried red and green party flags and waved them while political songs played on the public address system.“I have been struggling to get justice against election rigging, but our laws are such that they deny justice to people, that is why I have to bring this movement to streets,” Khan added.Khan and Qadri claim the 2013 elections were massively rigged, local and foreign observers said the polls were credible.Their followers clashed with police in late August after they tried to storm the prime minister’s residence, leaving three demonstrators dead and hundreds injured on both sides.On September 1, the opposition groups briefly occupied the state broadcaster but the movement has since lost momentum.Analysts believe the protests have been coordinated by the powerful army as a means of re-asserting its dominance over civilian authorities.