CHITRAL - At least four children were killed when a high intensity explosive material went off in village Royee near Garam Chashma area on Monday morning. Some children were collecting scrape in village Royee and they found an unexploded missile shell. The shell went off when they started playing with it. The explosion was so severe that all the four children died on the spot. The killed children were identified as Mirzat Ali Khan son of Ali Dada, Asif Neyab son of Gul Neyab, Amir son of Shahab and Asad Ali son of Said Noor.