 Such incidents may occur after a coup d'état (Thailand in 2006 and 2014, and Egypt in 2013); when threatened by popular protest (China, Tiananmen Square protests of 1989); to suppress political opposition (martial law in Poland in 1981); or to stabilize insurrections or perceived insurrections (Canada, the October Crisis of 1970).Martial law may be declared in cases of major natural disasters; however, most countries use a different legal construct, such as a state of emergency.Martial law has also been imposed during conflicts, and in cases of occupations, where the absence of any other civil government provides for an unstable population.