The former commander of Iraq's Republican Guard has accused the US of using non-conventional weapons in its war against the Middle East country.

Saifeddin Fulayh Hassan Taha al-Rawi told Al Jazeera that US forces used neutron and phosphorus bombs during their assault on Baghdad airport before the April 9 capture of the Iraqi capital.

Al-Rawi is one of the most wanted associates of Saddam Hussein, the deposed Iraqi leader, still on the run.

"The enemy used neutron and phosphorus weapons against Baghdad airport... there were bodies burnt to their bones," he said.

The bombs annihilated soldiers but left the buildings and infrastructure at the airport intact, he added.

A neutron bomb is a thermonuclear weapon that produces minimal blast and heat but releases large amounts of lethal radiation that can penetrate armour and is especially destructive to human tissue.

About 2,000 elite Republican Guard troops "fought until they were martyred", said al-Rawi.

He said the Iraqi military command was surprised by the speed of the US land offensive, expecting air bombardment to last much longer.

"We had not expected the enemy to launch its land offensive from the very first or second day.

We expected the air raids to last at least a month," he said.

"The land offensive came at the same time as the air offensive. That was a situation we did not expect," he told Al Jazeera.

Al-Jazeera