The US has provided Yemeni police with gas canisters which have been used against anti-government protesters in capital Sana'a, local sources say.
Police have reportedly used nerve gas to quell peaceful protests in Sana'a's University Square. The empty canisters obtained by the locals bear the “Made in U.S.A.” stamp.
Sources say the canisters were a “gift” to the Yemeni police from the United States.
The protesters, who demand an end to President Ali Abdullah Saleh's 32-year rule, have been camping out in the square since February 21.
At least six anti-government protesters, including a school boy, were killed and hundreds more injured during clashes with the police on Saturday.
Saleh has promised a new constitution which would shift power from the presidency to an elected parliament. Protesters say that the offer is not enough, vowing to continue to demonstrate until he resigns.