A grenade explosion rocked the office of the Department of Environment and Natural Resources (DENR) in Bayugan City, Agusan del Sur, police reports said on Thursday. No one was reported hurt in the explosion that occurred at around 11:30 a.m. at the DENR office on Purok-8, Barangay, Maygatasan, Bayugan City, reports reaching the Philippine National Police operations center in Camp Crame said. Unidentified persons tossed the hand grenade at the said government office before scampering off on a motorcycle. The blast damage was placed at P10,000, reports said. Responding policemen recovered from the scene of the a hand grenade safety lever and sharp nails.