Sanaa , Yemen ( CNN ) -- One person was killed in an anti-government protest in the Yemeni city of Aden on Wednesday , eyewitnesses reported , while human rights activists accused pro-government demonstrators of beating students after a similar protest in the capital , Sanaa . Witnesses in Aden said the victim was an 18-year-old who had been shot by security forces trying to disperse the crowd . Video distributed by student activists appeared to show the youth being carried away , bleeding heavily from his left side . But CNN could not independently confirm the authenticity of the video , and there was no immediate confirmation of the fatality from hospital officials . The Aden protest drew thousands of demonstrators , mostly students , to the city 's Al Mansoora district for a sixth straight day . And in Sanaa , students at Sanaa University rallied inside the gates of the campus in a demonstration organized by the head of the university 's student union , said Omar Al-Nihmi , a third-year media student at the school . The three students injured in Sanaa were attacked while on their way home from the university demonstration , human rights activist Abdul Rahman Barman said . Barman said he took one of the students to the hospital with head injuries from being hit with sticks , but the other two had only minor injuries . The students started out calling for an improved curriculum , for removal of the university dean and for security forces to remain off-campus . But about 90 minutes into the event , the mood turned anti-government , said third-year student Salah Al-Janadi . More students showed up , both Al-Nihmi and Al-Janadi said , and the protesters began chanting anti-government slogans such as `` The people want the fall of the regime '' and `` Oh Ali , son of Saleh , your regime is no good . '' They also chanted , `` Our protests are peaceful and we do n't have weapons . '' Shortly afterward , hundreds of pro-government demonstrators turned up -- but they were outside the university gates , while the students were inside . The pro-government demonstrators began throwing rocks , Al-Janadi said . Al-Janadi said he was told by the protest organizers `` that because today 's protest was a student union protest at the university , security forces at the scene would not interfere . '' Hundreds of police were on the scene as well . They did not interfere with protesters , Al-Janadi said , but fired bullets into the air , successfully dispersing the crowds . It was at least the sixth day that scuffles had broken out between pro- and anti-government protesters in Yemen , amid unrest and anti-government demonstrations in other Middle Eastern countries . Yemeni President Ali Abdullah Saleh has been in power for 32 years and has pledged not to run for re-election when his current term ends in 2013 . Journalist Hakim Almasmari contributed to this report for CNN .
NEW : Hospital officials give no immediate confirmation that a demonstrator is killed in Aden . Three Sanaa University students were hurt after a protest there . Yemen has seen six days of clashes between pro- and anti-government crowds .