Cairo ( CNN ) -- Six people were killed and at least 300 were injured when pro-democracy activists clashed Friday with Egyptian security forces in central Cairo , a government official said . Two of the dead were teenagers and one was an Islamic scholar , said Dr. Hisham Shiha , a spokesman for the Ministry of Health . At least four of the fatalities suffered gunshot wounds , with one person shot in the back of the head , he said . Adel Saeed , a spokesman for the general prosecutor , said an investigation is under way . `` We are questioning 14 men detained at scene of clashes and we have a team now at two hospitals questioning the injured to understand how the injuries were inflicted , '' he said . A separate team was at the morgues following up on the deaths , he said . Meanwhile , people were throwing Molotov cocktails , rocks and glass . Men wearing what appeared to be military uniforms tossed bricks and concrete on protesters from atop a six-story building . A Ministry of Transportation building burned nearby , and tents in an activist encampment in front of parliament caught fire . The military fired warning shots into the air and sprayed water cannons to disperse the crowd . Shiha said nearly 100 people were hurt , including nine who were shot by live ammunition . Saeed said 12 people were charged with destroying public property . Are you in Cairo ? Tell us what the mood is like . A Ministry of Interior official denied police were involved . `` This situation has nothing to do with the police or the Ministry of Interior , and we do not have forces at the site of the clashes , '' said Gen. Marwan Mustapha , a ministry spokesman . A doctor at a clinic said he had treated dozens of protesters for cuts and injuries caused by flying glass and rocks . `` It all started when the military arrested one man , and then an hour later he emerged from building barely able to walk from the beating , '' said activist and video blogger Walid Nada . `` His face and body and clothes ( were ) blotched with blood as the protesters carried him to ( a ) makeshift hospital . '' Activist Mona Seif identified the beaten man as Aboudi Ibrahim . He `` has no broken bones , but major bruises to the face , cuts and harsh burns from electric shockers . We are filling a police report soon , '' she said . Activists have been camping outside parliament in protest of the military-appointed prime minister .
NEW : 6 are dead and at least 300 injured , the Egyptian Health Ministry says . An investigation is under way , a government spokesman says . Glass , rocks and Molotov cocktails are thrown . The beating of an activist sparked the violence , activists say .