rural civilians to defend their property. The brittle salt was unlikely to cause serious injury at long ranges, but would cause painful stinging injuries and served as a warning. British gamekeepers have used rock salt shells to deter poachers. Rather than get into a physical confrontation, they stalk the poachers, making themselves known by a loud shout of "Run!" just before firing, to avoid hitting the now-fleeing subject in the eyes. Rubber slugs or rubber buckshot are similar in principle to the bean bag rounds. Composed of flexible rubber or plastic and fired at low velocities, these rounds are probably the most common choice for riot control. Taser International announced in 2007 a new 12-gauge eXtended Range Electronic Projectile or XREP, which contains a small electroshock weapon unit in a carrier that can be fired from a standard 12-gauge shotgun. The XREP projectile is fin stabilized, and travels at an initial velocity of 100 m/s (300 ft/s). Barbs on the front attach the electroshock unit to the target, with a tassel deploying from the rear to widen the circuit. A twenty-second burst of electrical energy is delivered to the target. This product was expected to be released to market in 2008. They were used—despite still being subject to testing, in breach of the supplier's license—by Northumbria police in their standoff with Raoul Moat in 2010. Breaching rounds, often called frangible, Disintegrator, or Hatton rounds, are designed to destroy door locking mechanisms without risking lives. They are constructed of a very brittle substance that transfers most of the energy to the primary target but then fragment into much smaller pieces or dust so as not to injure unseen targets such as hostages or non-combatants that may be standing behind a breached door. Bird bombs are low-powered rounds that fire a firecracker that is fused to explode a short time after firing. They are designed to scare animals, such as birds that congregate on airport runways. Screechers fire a pyrotechnic whistle that emits a loud whistling sound for the duration of its flight. These are also used to scare animals. Blank shells contain only a small amount of powder and no actual load. When fired, the blanks provide the sound and flash of a real load, but with no projectile. These may be used for simulation of gunfire, scaring wildlife, or as power for a launching device such as the Mossberg #50298