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.
But it also announced on Tuesday a Supreme Court commission to investigate allegations of rigging in the 2013 poll.
This was dismissed by Mr Khan, who vowed to press ahead with the march from Lahore to Islamabad saying that only Mr Sharif's resignation would stop the rally now.
The BBC's Shahzeb Jillani in Islamabad says the stand-off is seen as the biggest challenge yet to Mr Sharif's government.
There is is anxiety and uncertainty about what will happen on the streets of the capital later, our correspondent adds.
Mobile phones jammed
Mr Khan addressed a crowd in Lahore before taking his place in a truck as part of a convoy of hundreds of vehicles bound for the capital, Islamabad.
Tens of thousands of security personnel have been deployed in Islamabad and in cities across Punjab province.
Roadblocks have been placed on all major entry and exit points to the two cities. The mobile phone network has also been partially suspended.
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.
But it also announced on Tuesday a Supreme Court commission to investigate allegations of rigging in the 2013 poll.
This was dismissed by Mr Khan, who vowed to press ahead with the march from Lahore to Islamabad saying that only Mr Sharif's resignation would stop the rally now.
The BBC's Shahzeb Jillani in Islamabad says the stand-off is seen as the biggest challenge yet to Mr Sharif's government.
There is is anxiety and uncertainty about what will happen on the streets of the capital later, our correspondent adds.
Mobile phones jammed
Mr Khan addressed a crowd in Lahore before taking his place in a truck as part of a convoy of hundreds of vehicles bound for the capital, Islamabad.
Tens of thousands of security personnel have been deployed in Islamabad and in cities across Punjab province.
Roadblocks have been placed on all major entry and exit points to the two cities. The mobile phone network has also been partially suspended.
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