From 10:00 25 May 2005 to 16:00 26 May 2005, Moscow's power supplies were the centre of a major incident, which resulted in the supply being outed for several hours in many of City of Moscow districts, as well as Moscow, Tula, Kaluga and Ryazan provinces. Some tens of thousands of people were trapped in stranded underground trains in the Moscow Metro and in elevators, railway signaling was put out of action and many commercial and governmental organisations were paralysed.[1][2][3]