updated 12/27/2009 1:22:53 PM ET 2009-12-27T18:22:53

A suicide bomber detonated his explosives outside a large gathering of Shiite Muslims in the capital of Pakistan-controlled Kashmir on Sunday, killing five people and wounding 80, said police.

The attacker blew himself up as police tried to search him at a checkpoint set up outside the event — part of the annual commemorations of the seventh century death of the Prophet Muhammad's grandson — said police officer Tahir Qayum. The five killed included two police, he said.

Most of the 80 injured were Shiites attending the gathering in Muzaffarabad that attracted about 1,000 people, said police officer Sardar Ilyas. Ten of the wounded are in critical condition, he said.

Minority Shiites in Pakistan have often been targeted by radical Sunnis during similar tributes, held every year during the Islamic holy month of Muharram. But Ilyas said there was no history of such sectarian clashes in Muzaffarabad.

Authorities called the army in after the attack to restore order, said Kafayat Hussain, a local minister.

Plagued by violence
Pakistan has been plagued by rising violence since the military launched a large ground offensive in mid-October in the militant stronghold of South Waziristan in the country's lawless tribal area near the Afghan border.

Three bombs planted in a government official's house in another tribal area exploded Sunday, killing him along with his wife and five children in an attack police said was retaliation for military operations targeting Taliban. The military has stepped up airstrikes in Kurram where many militants fled following the South Waziristan offensive.

Sunday's attack in Sadda city targeted the house of Sarbraz Saddiqi, a government official in Kurram, said police officer Naeemullah Khan. Police are investigating how the bombs, which were timed to explode, were planted in Saddiqi's house, he said. The explosion also wounded three people.

Many Taliban militants are also believed to have fled to North Waziristan, an area in Pakistan's tribal region dominated by jihadi groups launching cross-border attacks against coalition forces in Afghanistan.

As the army pursues a handful of offensives against militants, political turmoil in Islamabad, including calls for Pakistan's embattled president to step down, has threatened to distract the government.

'A conspiracy'
President Asif Ali Zardari played to those fears Sunday, accusing those demanding his resignation of threatening the state's democratic system. His defiant remarks were made in his first public appearance since the Supreme Court struck down an amnesty protecting him and several other senior ruling party officials from corruption charges. In a speech marking the second anniversary of the bombing death of his wife, former Prime Minister Benazir Bhutto, Zardari said opponents working to bring down his government were "colluding" with militants.

"It is a conspiracy to weaken Pakistan," said Zardari, standing in front of a few thousand people near Bhutto's tomb in her ancestral village of Garhi Khuda Bakhsh in southern Pakistan.

The amnesty struck down by the Supreme Court was issued by former President Pervez Musharraf as part of a U.S.-backed deal to allow Bhutto to return from self-imposed exile. After her death, Zardari led the ruling Pakistan People's Party to victory.

Zardari enjoys legal immunity while president, but analysts have said he could be vulnerable if opponents challenge his original eligibility to run for office.

Deadly attacks
Political turmoil is the last thing Washington wants to see as it presses Pakistan to target militants undermining the U.S. fight in Afghanistan.

In the face of Islamabad's reluctance, the U.S. has relied more heavily on drone missile strikes in Pakistan's tribal areas, including one Saturday in the Babar Raghzai area of North Waziristan.

Pakistani intelligence officials on Sunday raised the death toll from the strike to 13 after eight more bodies were pulled from the rubble and two wounded died in the hospital.

The U.S. rarely discusses the covert program but has in the past said it has taken out several top al-Qaida operatives.

Most of the people killed in Saturday's strike were militants, said the intelligence officials, speaking on condition of anonymity because they were not authorized to talk to the media.

Pakistan publicly opposes the strikes but is believed to secretly aid them.

Copyright 2009 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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