Yemeni security forces yesterday killed three members of an anti-US group, whose leader was killed in clashes with government forces last September, official sources said. The three men, who belonged to the "Believing Youth" group, were killed in a gunfight with security forces in the Saada province. They were reportedly leading members in the group, whose armed supporters fought government forces in remote mountains of Saada for more than 10 weeks. The clashes, that left more than 400 soldiers and rebels dead, ended on Sept. 10 with the killing of the group's leader Hussein Badruddin Al-Houthi. Yesterday's clash erupted when a group of five Believing Youth members refused to surrender while on their way back from an arms market out of the province's center, a website run by the Defense Ministry said citing an unnamed local official.