Pakistanis will vote on Wednesday to elect a new National Assembly and provincial assemblies in an election campaign marred by terror attacks, hundreds of arrests and accusations of interference by the military.

With former Prime Minister Nawaz Sharif in jail over corruption charges along with his daughter and son-in-law, the main contest will be between his demoralized Pakistan Muslim League-Nawaz (PML-N) and cricketer-turned-politician Imran Khan's PTI which critics say enjoys the backing of the military and the Inter-Services Intelligence (ISI).