As this breaking story unfolds, more details are being released on the actual mission.

The mission that killed one of the world's most notorious terrorist leaders was carried out by U.S. forces with the cooperation of Pakistan, U.S. President Barack Obama said Sunday night.

Osama bin Laden -- the longtime leader of al Qaeda -- was killed by U.S. forces in a mansion about 100 kilometers, or 62 miles, north of the Pakistani capital of Islamabad along with other family members, a senior U.S. official told CNN.

Members of Pakistan's intelligence service, the ISI, were on site in Abbottabad during the operation, a senior Pakistani intelligence official said.

Bin Laden resisted the assault and was killed in a firefight, senior administration officials said.

The Pakistani intelligence official said he did not know who fired the shot that actually killed the terror mastermind.

U.S. sources including a senior official and a congressional source familiar with the operation said bin Laden was shot in the head.

Three other men were also killed in raid, as was a woman who was being used as a human shield, senior administration officials said.

The U.S. team was at the compound for about 40 minutes, the officials said. There were no casualties on the American side, although a U.S. helicopter crashed during the raid due to mechanical problems. The helicopter was then destroyed for security reasons, senior administration officials said.

via How U.S. forces killed Osama bin Laden - CNN.com.