Kazakhstan's National Security Committee said its agents tracked down four suspects hiding in an apartment building early today in Aktobe, a city in Kazakhstan's northwest, about 70 kilometers south of the Russian border.
The agency said the suspects refused to surrender, fired on police and security officers, and were killed in the ensuing gunbattle.
Another gunman fired at police at a different location and was killed by retaliatory fire. Two police officers were wounded, the committee said.
Kazakhstan's authorities described the violence as a terror attack and blamed it on religious extremists. Police and security forces have launched a sweeping hunt for those involved in the attacks.
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The National Security Committee said today that it was continuing the search for some attackers who have remained at large.
The violence has shaken Kazakhstan and cast a serious challenge to 75-year old President Nursultan Nazarbayev, who has come to lead the energy-rich Central Asian nation as its Communist boss before the 1991 Soviet collapse.
Kazakhstan's economic fortunes has collapsed due to slumping prices for oil, its main currency earner, and the economy was expected to slow to 0.5 per cent this year.