One man is in custody after Vancouver Police officers discovered he was in possession of active explosives.

Investigators say they discovered what looked like two grenades during a routine traffic stop Thursday night, forcing them to close down several blocks while they carefully detonated them in a nearby school field.

The grenades were found in the back of a cargo truck at an Esso station near Fraser Street and King Edward Avenue.

Shortly after 7 p.m., police received a 9-1-1 call about a suspicious person in the area. Officers arrived and found the man in the driver’s seat of a vehicle parked beside the convenience store at the gas station.

Officers spoke with the 33-year-old man and found he was in possession of a small amount of marijuana. Further investigation found he was a prohibited driver and police also seized a set of brass knuckles from his pocket.

Upon a search of the truck, police allegedly located throwing knives, a tactical vest, and two hand grenades.

The Vancouver Police Explosive Disposal Unit analyzed the devices in the back of the truck with the use of mobile robot.

The grenades were x-rayed and police determined they were active explosive devices. The devices were collected and taken to a nearby field where they were safely disposed of by way of a controlled detonation.

The 33-year-old man from Surrey is now facing multiple charges. He remains in custody.