Also missing from the truck is a green case carrying ammunition for the launcher and a black backpack with electronic equipment.
Police say the items fell from an open hatch of a truck canopy at around 7:30 a.m. on July 23 in the area of Golden Ears Bridge, BC.
A passing motorist alerted the truck driver, a member of the Integrated Emergency Response Team, that a hatch was open.
The driver stopped to check if anything had fallen out and noticed that a camouflage bag with the launcher was missing.
"We are very concerned about the loss of these items and are doing all we can to locate them," says Staff Sgt. Annie Linteau, Senior Media Relations Officer. "We ask anyone who locates these items to refrain from handling them and to call police immediately."
The weapon is an Abrams Airborne Manufacturing 40MM Multi-Shot Less-Lethal Tactical Launcher (LTL). It is commonly used for crowd control using less-than-lethal grenades, like those containing tear gas and rubber pellets. It can also fire lethal ammunition.
According to the manufacturer's website, the LTL can fire six grenades in three seconds, covering a large area.
Police thoroughly searched the area, but did not find the items.
An investigation is ongoing to find out how the driver lost the items.
The RCMP is Canada's federal police. They are known as "Mounties" colloquially and as "the Force" internally. The RCMP was formed in 1920 and employs more than 28,000.