is a homemade bomb constructed and deployed in ways other than in conventional military action. It may be constructed of conventional military explosives, such as an artillery round, attached to a detonating mechanism. IEDs may be used in terrorist actions or in unconventional warfare by guerrillas or commando forces in a theater of operations. In the second Iraq War, IEDs were used extensively against US-led Coalition forces and by the end of 2007 they had become responsible for approximately 63% of Coalition deaths in Iraq. They were also used in Afghanistan by insurgent groups, and caused over 66% of the Coalition casualties in the 2001–2021 Afghanistan War. Throughout The Troubles, the Provisional IRA made extensive use of remote control IEDs against the British security forces. Initially, bombs were detonated either by timer or by simple command wire, but later in the conflict, bombs could be detonated by radio control; simple servos from radio-controlled aircraft were used to close the electrical circuit and supply power to the detonator. Roadside bombs were also extensively used; they were typically placed in a drain or culvert along a rural road and detonated by remote control when British security forces vehicles were passing. The IRA also used secondary devices to attack British reinforcements sent in after an initial blast as occurred in the Warrenpoint Ambush. IRA bombs became highly sophisticated, featuring anti-handling devices such as a mercury tilt switch or microswitches. These devices would detonate the bomb if it was moved in any way. Typically, the safety-arming device used was a clockwork Memopark timer, which armed the bomb up to 60 minutes after it was placed by completing an electrical circuit supplying power to the anti-handling device. Depending on the particular design, an independent electrical circuit supplied power to a conventional timer set for the intended time delay, e.g. 40 minutes. However, some electronic delays developed by IRA technicians could be set to accurately detonate a bomb weeks after it was hidden. After the British developed jammers, IRA technicians also developed devices that required a sequence of pulsed radio codes to arm and detonate them that were harder to jam. Starting six months before the invasion of Afghanistan by the USSR on 27 December 1979, the Afghan Mujahideen were supplied by the CIA, among others, with large quantities of many different types of anti-tank mines. The insurgents often removed the explosives from several anti-tank mines