A 13-year-old child was killed and his brother, a seven-year-old boy, was injured Thursday when an explosive device blew up in the Palestinian city of Khan Yunis. "The explosion took place today afternoon and the injured child was admitted to Nasser Hospital to undergo operation," a statement of the Palestinian interior ministry said. The statement added that two hours ahead of this explosion, a Qassam Missile had fallen on a house in the city. It warned citizens and armed factions of using such devices.