RATNANAGAR: A bomb disposal squad of the Nepal Army deactivated one of the two grenades found planted in Bharatpur Metropolitan City-5 of Chitwan district on Sunday morning. However, the other grenade planted near the metropolitan city's Ward-5 office in Geetanagar went off before the army squad could dispose it, according to Deputy Superintendent of Police Prabhu Prasad Dhakal at the District Police Office, Chitwan. The grenade was discovered at 2 am today. However, no casualties were reported in the explosion except that the window panes at the Ward Office were shattered, the Chitwan District Police Office said. Police suspect that the grenades might have been planted by a group trying to disrupt the election environment by terrorising the voters ahead of the elections.