A teenager was killed in clashes with police in the Egyptian capital as families stormed a police station to free detainees held on drugs charges, a security official told AFP on Tuesday. Police and soldiers arrested around 50 people from the shanty town of Ezbet Abu Qarn in a drugs raid on Sunday, the official said. On Monday, angry families stormed the station where the suspects were being held, triggering clashes with security forces in which an 18-year-old boy was killed. The army intervened to restore calm, the official said. It was not immediately clear how the boy was killed. The incident coincided with other clashes on Monday night as a court bailed seven police officers accused of killing protesters during the anti-regime uprising which ousted president Hosni Mubarak in February. Security services said family members of victims attacked the courthouse on the outskirts of Cairo, before blocking traffic on a highway to Suez where the killings took place. The seven police officers were released on bail and their trial, which is being held in Cairo because of the sensitivity of the case in Suez, was adjourned until September 14. The seven are among 14 officers charged with the murder of 17 protesters and wounding of 300 others. The other seven are on the run and being tried in absentia. The case comes at a time of heightened tension in Egypt over the handling of legal cases against security forces who used lethal force during the uprising, killing 846 civilians and wounding thousands, according to official figures.