HILO, Hawai'i — County officials closed the Hilo landfill, transfer station and recycling center this morning after construction crews discovered old military ammunition at the site.

Crews have been installing utilities near the transfer station as part of a larger project to construct a sort station to boost county recycling efforts.

Neil Gyotoku, spokesman for county civil defense, said initial reports suggested a crew uncovered old .50-caliber machine gun rounds, but it was unclear whether other old ammo or explosives might also be at the site.

Gyotoku said crews specializing in unexploded ordnance disposal are being called in from the Pohakuloa Training Area to dispose of the ordnance.

The county landfill and the facilities round it are closed until further notice, he said.