Shillong: Suspected Garo National Liberation Army (GNLA) rebels lobbed a grenade at Williamnagar police station late Sunday night but there were no casualties, police said. The rebels tossed the grenade at Williamnagar police station in the district headquarter of East Garo Hills at around 11.30 p.m. Meanwhile, police have launched a manhunt to nab the attackers. (IANS)