Two teenage secondary school students were injured in Petralona near central Athens yesterday when they were attacked by other teens armed with sharp weapons, police said, raising concerns about the increase in violence at schools. The 16-year-olds, attacked outside a senior high school at about 1.30 p.m., suffered minor injuries when two fellow students, also aged 16, assaulted them with a sharp object believed to be a knife or a screwdriver. The victims were taken to a medical clinic with stomach wounds. Police, who reached the scene shortly after the skirmish, said personal issues prompted the attack. The two suspects and the victims did not attend the school where the incident took place, police added. Authorities have launched an investigation to locate the culprits.