It caused quite a scare when the grenade was sighted in a drain, but the cops told the press that it is a toy, and nothing more:

ASP Alejandro Cowo - OC, CIB Belize City
"Yesterday, just after 9 p.m., police were called to #27 Castle Street, where a suspected grenade was seen on the street side. The BDF expert, Staff Sergeant Ramirez, was called in. After 2 hours inspecting the location and the grenade, it was found to be toy grenade."

Daniel Ortiz
"Cannot be used for any specific purpose."

ASP Alejandro Cowo
"No, it cannot, none at all."