It's a hard war:

"Al-Qaida has prepared 15 cars filled with explosives for suicide attacks in Iraq, reports intelligence newsletter Geostrategy-Direct..

Iraqi security sources said the vehicles include ambulances designed to penetrate protected facilities, such as police stations and Coalition Provisional Authority offices.

Some of the vehicles, outfitted with TNT and shrapnel, had been stolen or obtained along the Iraqi-Turkish border, the sources said.

Other ambulances have been stolen in Baghdad and have been prepared for suicide attacks in northern and central Iraq."

Then there's this:

"Additional reports indicate that ambulances and other medical convoys were used to deliver military orders and transport Fedayeen paramilitary fighters. On March 31, three U.S. soldiers were wounded after Iraqi Fedayeen fighters used a Red Crescent ambulance to attack them near Nasiriya, according to military reports."

And this:

"BAGHDAD: Three ambulances packed with explosives, one with as much as 1,000 kilograms, were discovered by US and Iraqi forces here in the past few days, a senior US military spokesman said on Thursday.

'Terrorists have taken on a new ambitious tactic in recent days. Iraqi and coalition security forces have foiled numerous attacks involving ambulances,' said Lt-Col George Krivo. 'Two Iraqi ambulances were stopped at a checkpoint in Baghdad. While the first ambulance was being searched, the second one sped off,' he said."

Wasn't an ambulance filled with explosives implicated in the attack on the Red Cross last October?