Pakistan protest march led by Imran Khan begins
Anti-government protesters in Pakistan have begun travelling from Lahore to Islamabad, amid tight security.
The rally is being led by opposition politician Imran Khan, who wants PM Nawaz Sharif to resign for failing to probe fraud in last year's polls.
An anti-government cleric Tahirul Qadri, who wants to lead a separate march, is being prevented from leaving Lahore.
The government accuses the protesters of trying to derail democracy.
14 Aug 2014