Afghan President Hamid Karzai on Friday flew into Pakistan for talks likely to focus on stepping up efforts to broker peace with the Taliban after nearly a decade of conflict in both countries.

He is the first head of state to visit since U.S. Navy SEALs killed Osama bin Laden in the Pakistani city of Abbottabad on May 2, which has heightened calls within the United States for a peace settlement in Afghanistan.

A suicide bomber targeted prayers for a prominent assassinated Afghan police chief on Friday, killing four policemen but another top officer escaped unharmed, officials said.

Eighteen other people were wounded in the attack in Kunduz city, capital of the province of the same name which has become a Taliban bastion in recent years and seen an increase in insurgent assaults.

Nine people were killed and five others wounded when gunmen attacked a wedding party in eastern Afghanistan overnight, a provincial spokesman said Thursday.

The groom was a relative of the district chief in Dur Baba of Nangarhar province, and women and children were among the casualties, said the spokesman Ahmad Zia Abdulzai.

Afghan President Hamid Karzai said Tuesday the U.S.-led NATO military in Afghanistan risks becoming an "occupying force" if aerial bombings which cause civilian casualties continue.

His outspoken remarks came days after he issued a "last warning" to foreign forces over civilian casualties following Saturday's killing of what he said was 14 civilians including women and children in an air strike.

President Hamid Karzai on Sunday scolded the U.S. military for "arbitrary and unnecessary" missions that kill Afghan civilians, saying it was his last warning on the issue after 14 died in an air strike.

Citing initial reports that 10 children, two women and two men were killed in a strike in the southern province of Helmand on Saturday, Karzai said such operations amounted to the "murdering of Afghanistan's children and women."

Afghan President Hamid Karzai urged international troops to "stop their operations in our land" Saturday on a visit to relatives of nine children killed in a NATO air strike.

"I would like to ask NATO and the U.S. with honor and humbleness and not with arrogance to stop their operations in our land," Karzai said.

A suicide car bomb attack killed an intelligence agent and wounded 26 other people in an Afghan town on the Pakistan border Thursday, officials said, in the latest in a wave of blasts.

The explosives-packed vehicle with two bombers inside blew up in Spin Boldak after intelligence agents acting on a tip-off opened fire in a bid to stop it, Lutfullah Mashal, a spokesman for Afghanistan's national spy agency, said.

NATO blamed the Taliban on Thursday over an attack on an Afghan wedding that killed more than 40 people in an area U.S.-led troops are massing to dislodge insurgents from their fiefdom.

The cause of the carnage has been unclear, but the government said initial reports indicated that a suicide bomber strapped with explosives had walked into the party reportedly attended by members of an anti-Taliban militia.