Video Related To: Bahrain uprising: Police fire tear gas, rubber bullets on protesters (PHOTOS)

5:36pm UK, Sunday March 13, 2011 news.sky.com Katie Cassidy, Sky News Online Up to 100 people have been wounded in Yemen's capital Sanaa after police fired live bullets and tear gas at anti-government protesters, reports said. In the latest clashes between security forces and demonstrators, at least one person was in a critical condition after being shot and more than 20 suffered gas inhalation. Hospital reports also claimed protesters had been attacked by police and regime-supporters wielding clubs and machetes. At least seven people have been killed in two days, including a teenage boy, in the escalating violence across the country. In Sanaa, fighting broke out on Saturday when police moved in on a camp occupied by protesters near the city's university. Officers fired live bullets, tear gas and water cannons while the crowds responded with a hail of rocks. The demonstrators want president Ali Abdullah Saleh, who has been in power for 32 years, to step down. Doctors in Sanaa claimed the tear gas used against the protesters was toxic as it appeared to affect the nervous system. An injured protester is treated in a mosque yard in Yemen's capital The accusation was dismissed by Yemen's interior ministry, but protesters were quick to erected banners labelling the president "Chemical Ali". The US government, which considers Mr Saleh an ally in its fight against an al Qaeda cell based in Yemen, said it was concerned by the increasing violence. "We call on the Yemeni government <b>...</b>