Dear Iraq insurgents...

...when can America expect a thank-you note for our largesse?

The US military cannot account for 190,000 AK-47 assault rifles and pistols given to the Iraqi security forces, an official US report says.

The Government Accountability Office (GAO) says the Pentagon cannot track about 30% of the weapons distributed in Iraq over the past three years.

The Pentagon did not dispute the figures, but said it was reviewing arms deliveries procedures.

About $19.2bn has been spent by the US since 2003 on Iraqi security forces.

GAO, the investigative arm of the US Congress, said at least $2.8bn of this money was used to buy and deliver weapons and other equipment.

Correspondents say it is now feared many of the weapons are being used against US forces on the ground in Iraq.

I'm sure these 190,000 weapons were not intended as a gift, but you should still at least say thank you or send us some cookies.

Oh, and also, please stop killing people. I know, I know, we're doing it too, but two wrongs hardly make a right, do they?