Gov't supporters take over army vehicles, throw rocks at protesters from surrounding buildings, according to reports; gun shots heard at Tahrir square after protests turn violent; over 100 reported injured. Pro-Mubarak groups took over three army vehicles and lobbed rocks and other items at anti-government protestors from surrounding buildings, amid clashes that have been raging at Tahrir Square since Wednesday afternoon, Al-Jazeera reported. Witnesses at Tahrir Square also said they heard several shots fired into the air, according to the report. Earlier Wednesday, protests in Cairo turned violent, with protesters throwing large rocks at each other as pro-Mubarak demonstrators tore...