Supporters of opposition leader Qadri escort a boy suffering from the effects of tear gas fired by riot police in Islamabad
Supporters of Tahir ul-Qadri, Sufi cleric and opposition leader of political party Pakistan Awami Tehreek (PAT), escort a boy suffering from the effects of tear gas fired by riot police in Islamabad August 31, 2014. Pakistan has been shaken by weeks of anti-government demonstrations, with violence erupting late on Saturday after thousands tried to march on Pakistan's Prime Minister Nawaz Sharif's residence, prompting police to fire tear gas to stop them. REUTERS/Zohra Bensemra (PAKISTAN - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
A supporter of opposition leader Qadri gestures in Islamabad
A supporter of Tahir ul-Qadri, Sufi cleric and opposition leader of political party Pakistan Awami Tehreek (PAT), gestures in Islamabad August 31, 2014. Pakistan has been shaken by weeks of anti-government demonstrations, with violence erupting late on Saturday after thousands tried to march on Pakistan's Prime Minister Nawaz Sharif's residence, prompting police to fire tear gas to stop them. REUTERS/Zohra Bensemra (PAKISTAN - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
A supporter of opposition leader Qadri gestures in Islamabad
A supporter of Tahir ul-Qadri, Sufi cleric and opposition leader of political party Pakistan Awami Tehreek (PAT), gestures in Islamabad August 31, 2014. Pakistan has been shaken by weeks of anti-government demonstrations, with violence erupting late on Saturday after thousands tried to march on Pakistan's Prime Minister Nawaz Sharif's residence, prompting police to fire tear gas to stop them. REUTERS/Zohra Bensemra (PAKISTAN - Tags: POLITICS CIVIL UNREST)
Supporters of opposition leader Qadri carry a man suffering from the effects of tear gas fired by riot police in Islamabad
Supporters of Tahir ul-Qadri, Sufi cleric and opposition leader of political party Pakistan Awami Tehreek (PAT), carry a man suffering from the effects of tear gas fired by riot police in Islamabad August 31, 2014. Pakistan has been shaken by weeks of anti-government demonstrations, with violence erupting late on Saturday after thousands tried to march on Pakistan's Prime Minister Nawaz Sharif's residence, prompting police to fire tear gas to stop them. REUTERS/Zohra Bensemra (PAKISTAN - Tags: POLITICS CIVIL UNREST)
Supporters of opposition leader Qadri help a man suffering from the effects of tear gas fired by riot police in Islamabad
Supporters of Tahir ul-Qadri, Sufi cleric and opposition leader of political party Pakistan Awami Tehreek (PAT), help a man suffering from the effects of tear gas fired by riot police in Islamabad August 31, 2014. Pakistan has been shaken by weeks of anti-government demonstrations, with violence erupting late on Saturday after thousands tried to march on Pakistan's Prime Minister Nawaz Sharif's residence, prompting police to fire tear gas to stop them. REUTERS/Zohra Bensemra (PAKISTAN - Tags: POLITICS CIVIL UNREST)
Supporters of opposition leader Qadri escort a boy suffering from the effects of tear gas fired by riot police in Islamabad
Supporters of Tahir ul-Qadri, Sufi cleric and opposition leader of political party Pakistan Awami Tehreek (PAT), escort a boy suffering from the effects of tear gas fired by riot police in Islamabad August 31, 2014. Pakistan has been shaken by weeks of anti-government demonstrations, with violence erupting late on Saturday after thousands tried to march on Pakistan's Prime Minister Nawaz Sharif's residence, prompting police to fire tear gas to stop them. REUTERS/Zohra Bensemra (PAKISTAN - Tags: POLITICS CIVIL UNREST)
Pakistani opposition to press on with protests until Sharif resigns
PAKISTAN-CRISIS/:Pakistani opposition to press on with protests until Sharif resigns
Supporters of Tahir ul-Qadri, Sufi cleric and leader of political party Pakistan Awami Tehreek (PAT), carry an injured fellow protester during the Revolution March in Islamabad
Supporters of Tahir ul-Qadri, Sufi cleric and leader of political party Pakistan Awami Tehreek (PAT), carry an injured fellow protester during the Revolution March in Islamabad August 31, 2014. Thousands of protesters massed outside the residence of Pakistani Prime Minister Nawaz Sharif on Saturday to demand he step down, after efforts to find a negotiated solution to the country's political crisis failed.Pakistan has been gripped by unrest for more than two weeks, with protest leaders Imran Khan and Tahir ul-Qadri saying they will not back back down unless Prime Minister Nawaz Sharif resigns. On Saturday Sharif once again said he would not go. REUTERS/Zohra Bensemra (PAKISTAN - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
Riot police run away from supporters of Tahir ul-Qadri, Sufi cleric and leader of political party Pakistan Awami Tehreek (PAT), during the Revolution March in Islamabad
Riot police run away from supporters of Tahir ul-Qadri, Sufi cleric and leader of political party Pakistan Awami Tehreek (PAT), during the Revolution March in Islamabad August 31, 2014. Thousands of protesters massed outside the residence of Pakistani Prime Minister Nawaz Sharif on Saturday to demand he step down, after efforts to find a negotiated solution to the country's political crisis failed.Pakistan has been gripped by unrest for more than two weeks, with protest leaders Imran Khan and Tahir ul-Qadri saying they will not back back down unless Prime Minister Nawaz Sharif resigns. On Saturday Sharif once again said he would not go. REUTERS/Akhtar Soomro (PAKISTAN - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
Supporters of Tahir ul-Qadri, Sufi cleric and leader of political party Pakistan Awami Tehreek (PAT), stand around empty gas canisters and rubber bullet casings after clashes with riot police during the Revolution March in Islamabad
REFILE - CORRECTING BYLINE Supporters of Tahir ul-Qadri, Sufi cleric and leader of political party Pakistan Awami Tehreek (PAT), stand around empty gas canisters and rubber bullet casings after clashes with riot police during the Revolution March in Islamabad August 31, 2014. Thousands of protesters massed outside the residence of Pakistani Prime Minister Nawaz Sharif on Saturday to demand he step down, after efforts to find a negotiated solution to the country's political crisis failed.Pakistan has been gripped by unrest for more than two weeks, with protest leaders Imran Khan and Tahir ul-Qadri saying they will not back back down unless Prime Minister Nawaz Sharif resigns. On Saturday Sharif once again said he would not go. REUTERS/Faisal Mahmood (PAKISTAN - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)