A homemade bomb exploded in an orphanage in Bulgaria's Western Thracian city of Kardzhali (Gyrcali) where Turks mostly live.
Three boys aged 13, 15 and 16 died when the bomb blasted at around 2 pm on Saturday. One of the boys died on the scene while the others were taken to the hospital where they later died.
Police officials investigate who made the bomb and how children reached it and psychologists help other children in the orphanage handle the tragedy.