Washington: The Pentagon on September 6 denied a report that it carried out the biggest single air strike in four years in Iraq, saying that September 5 attack on an air defence facility West of Baghdad was of "normal proportions".

The London-based 'Daily Telegraph' said a dozen US and British warplanes dropped precision bombs and that about 100 aircraft took part in the mission, which it said was the biggest single operation in Iraq in over four years.

"The number (of aircraft) is wrong. This idea that it's the largest strike in four years is wrong," said Lieutenant Colonel David Lapan, a Pentagon spokesman.

Lapan was unable to say how many warplanes took part in the strike but said it was "of normal proportions directed at a site that fired at US aircraft".

The strike targeted a command and control facility at an airfield 380 km West and slightly South of Baghdad, the US Central Command said on September 5.