Suspicious equipment has already been found on board, like living micro-organisms which can be used to spread disease, and a machine which can be used to produce germ warfare
materials, a military spokesman said.
If it's confirmed, it will be the first piece of concrete evidence that Iraq has weapons of mass destruction.
The US said the weapons were one of the main reasons why they invaded Iraq in the first place, but so far no real evidence of them has been found.
The Americans have been warned to be careful though, as there have been several false claims that evidence of weapons of mass destruction have been found.
But President George W Bush insisted the claims are true. "Saddam Hussein had weapons of mass destruction. It's well known," he said.