GRIFFITH’S main street was closed for six-and-a-half hours on Thursday after a grenade was found by a council worker. The shock discovery was made about 8.45am, with police quickly establishing an exclusion zone between Kooyoo Street and Jondaryan Avenue. Royal Australian Air Force Explosive Ordinance demolition personnel arrived about 3pm and declared the WWII-era grenade to be “inert”. It was believed to be a “Mk II” or “pineapple” fragmentation grenade, commonly used in WWII as an anti-personnel weapon.