KABUL - Four rockets hit Afghanistan's Bagram airfield, destroying a helicopter belonging to the NATO-led forces and killing three Afghan personnel inside, a spokesman for the coalition said on Tuesday.

The attack, which took place at around 10 pm local time on Monday, came on the eve of the 11th anniversary of the Sept. 11 attacks. Security across the capital, Kabul, was intensified.

Two personnel belonging to NATO's International Security Assistance Force (ISAF), who were also in the helicopter, were wounded, the spokesman said.

The helicopter was on a ramp in the airfield when the rockets hit.

The attack came a day after the United States handed control of the controversial giant Bagram prison and its 3,000 suspected Taliban inmates to Afghan authorities.

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