The Center for Research on Globalization says the bombs and missiles that the US-led military alliance has dropped on several Libyan cities contain depleted uranium (DU).
Mahdi Darius Nazemroaya, a research associate at the CRG center, told Press TV that there are several international missions in Libya to gather evidence on NATO war crimes, including the use of DU.
His remarks come weeks after the Stop the War Coalition said in its late March report that dozens of bombs and cruise missiles were launched by the US, British, and French forces -- all with DU warheads -- in the first 24 hours of the war on Libya.
DU munitions are controversial as their use is associated with long-term health concerns such as kidney damage, cancer, skin disorders and genetic defects.
Nazemroaya, who is currently in Tripoli, said that NATO was also violating international laws by "bombing civilian structures, hospitals, civilian homes and hotels" in various parts of Libya.
The developments come as the Western forces claim the operation in Libya is aimed at protecting civilians.
NATO has deployed its full range of aircraft in the war on Libya.
Scores of civilians have been killed in Libya since US-led forces launched aerial and sea attacks on the North African country.
Libyan troops have also killed thousands of civilians since a revolution started against Gaddafi in mid-February.
Experts say the main motive behind the Western attack on Libya is the vast oil reserves of the country.