Pakistan's Imran Khan and Tahirul Qadri in Islamabad rally

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Media captionRally leaders Imran Khan and Tahir ul Qadri have been calling for the prime minister to step down

Thousands of protesters have gathered in Pakistan's capital Islamabad after arriving in big convoys from Lahore.

Rally leaders Imran Khan and Tahirul Qadri demanded that Prime Minister Nawaz Sharif step down, alleging rigging in the 2013 elections.

Mr Qadri, an anti-government cleric, told his supporters in a midday speech to continue protesting until they bring a "peaceful revolution".

Last year's election saw the first civilian government transfer of power.

There was tight security in Islamabad as the protesters arrived in poor weather by truck, jeeps and cars after travelling the 350km (218 miles) from Lahore to Islamabad.

Cricketer-turned politician Imran Khan and cleric Tahirul Qadri, who have separate groups of supporters, have vowed to together bring one million followers on to the streets of the city.

Image copyright Getty Images
Image caption Imran Khan was Pakistan's most successful cricket captain before he entered politics in 1996
Image copyright AFP
Image caption The government has condemned the opposition, saying a rally would not remove the prime minister
Image copyright EPA
Image caption The sit-in is expected to continue throughout the weekend, although numbers are fewer than expected

Mr Khan, who heads the opposition Pakistan Tehreek-e-Insaaf party, said that the government was illegitimate, citing fraud and a failure to organise a probe into the elections.

He called for new elections, vowing to continue a sit-in until Mr Sharif resigns.

Police estimated the crowd was 60,000 strong.

Image copyright AP

At the scene: M Ilyas Khan

There is a carnival atmosphere on Islamabad's two parallel roads where the two opposition leaders, Imran Khan and Tahirul Qadri, are addressing thousands of followers. Most of the crowd comprises young men, but there are also women and children.

Most protesters have been walking since Friday when the march started from Lahore. They braved last night's heavy downpours. Many went away during the night, but many more have come back to listen to the leaders lay down their demands.

Many participants said they wanted change and would hang on for as long as their leaders wanted. But Mr Qadri's marchers in January of last year, facing the absence of toilets and an outbreak of viral diseases, could only continue for three days before he signed a hurried deal with the then government and called off the protest.

Mr Khan's convoy of protesters was pelted with stones on the way, in the city of Gujranwala.

Officials from Mr Khan's party said his vehicle was also shot at but he was not hurt.

A senior leader of Mr Sharif's ruling Pakistan Muslim League party announced that the government was ready to investigate the allegations of fraud from last year's elections, but said that Mr Sharif would not be removed through a rally.

The government says the protesters are trying to derail democracy. The prime minister's spokesman Pervaiz Rashid condemned the "irresponsible behaviour and actions" of his opponents.

Mr Khan's and cleric Tahirul Qadri's supporters are angry about the sinking economy, growing militancy, and failure to deliver core services such as a steady electricity supply.

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