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The 2002 Grozny OMON ambush occurred on April 18, 2002, when the Chechen insurgents killed about 21 and wounded seven republican OMON special police officers.
The ambush occurred just 90 metres from Chechnya's main police headquarters. The first bus in convoy hit a remote controlled mine, and the militants then opened fire on the line of vehicles from ruins of a nearby high-rise building.
The other version of the attack was presented by Nezavisimaya Gazeta, which claimed there were two connected attacks.
The incident preceded by two hours President Vladimir Putin's mid-term state-of-the-nation address, in which he said the "military phase" of the Chechen conflict had been completed.