SUSPECTED Islamic rebels killed one civilian and wounded 20 people, including three Indian border guards, when they hurled a grenade in a busy market in Kashmir overnight, officials said. "Militants threw a grenade at our vehicle which exploded on the road, injuring three of our men and 18 civilians," said a border guard spokesman, Manhas, who uses one name. Authorities said one of the wounded civilians died on the way to hospital.Security forces immediately sealed off the area in Sopore town, 50 km north of Indian Kashmir summer capital Srinagar, and launched a search for the attackers, the border guard spokesman said. None of the dozen rebel groups fighting to break away Kashmir from India had so far claimed responsibility for the blast.