Egyptian policeman, 2 Muslim Brotherhood demonstrators killed Supporters of deposed Egyptian President Mohamed Morsi hold signs after clashes near Republication Guard headquarters around the Raba El-Adwyia mosque square in Nasr City, a suburb of Cairo Egypt, July 8, 2013. CAIRO, July 24 (UPI) -- An Egyptian policeman and two Muslim Brotherhood protesters were killed in escalating violence across the country, officials said. Since the ouster of former president Mohamed Morsi earlier this month, clashes between his supporters and opponents have become an almost daily occurrence. Early Wednesday, a policeman was killed and 19 were injured after an explosive device was thrown from a passing car at a police station in Mansoura north of Cairo, Ahram Online reported. A number of police vehicles were damaged and windows in the building shattered, the site said. The terror act in Mansoura will not soften our will. We have won the war against terrorism once, and we shall win [it] today," Ahram Online quoted presidential adviser Ahmed el-Muslimani as saying. It was the second such attack on a police station in a week. On Saturday, a bomb exploded in the parking lot of a police station in Ismailia, causing damage but no injuries In a separate incident, Muslim Brotherhood officials said two of its supporters were killed in an early morning protest march in Cairo. Two fatalities and dozens injured with live ammunition after plain-clothed police attacked Shubra's anti coup rally. More blood on the hands of the military coup," the website said Gehad el-Haddad, a spokesman for the Brotherhood posted on his Twitter account.