Three Afghan troops were killed and a helicopter was destroyed after a US military base came under insurgent rocket attack, a coalition spokesman said on Tuesday, dpa reported.
A military chopper was destroyed Monday night, said Hagen Messer, a spokesman for the NATO-led International Security Assistance Force (ISAF).
Both ISAF and Afghan soldiers were in the helicopter at the time, he said. "Three Afghan national security forces died during the attack," he said, without giving further details.
The Taliban militants claimed responsibility for the attack.
Meanwhile, NATO in a statement confirmed the death of "two senior Taliban leaders" in an airstrike in the eastern province of Laghman.
"The Taliban leaders - Mullah Hazrat and Shakir - were killed in a precision airstrike Sunday when Afghan and coalition forces positively identified a group of armed insurgents in Alisheng district, and engaged them," it said.
Mullah Hazrat was a suspected mastermind of the August 2008 attack in which 10 French soldiers were killed, according to the statement.