A Bahraini teenager died on Wednesday after clashes between security forces and demonstrators marking the third day of mourning for a young man killed by a bomb blast last week, witnesses and activists said. The Interior Ministry said police was investigating a report that a dead person had been brought into a clinic in the Shi'ite Muslim town of Sitra, south of the capital Manama. The main opposition group al-Wefaq named the young man as Sayed Mahmoud Sayed Mohsen and said he was 15. Local residents described him as a "citizen journalist" who had been filming and photographing demonstrations and clashes and posting them on social media.