Oct. 8 (Bloomberg) -- Russia's Micex Index tumbled 14 percent, extending a record decline, led by energy companies including OAO Gazprom.

Gazprom, the world's biggest natural-gas company, fell 19.35 rubles, or 14 percent, to 121.80 rubles in the first 10 minutes of trading. OAO Lukoil, Russia's largest independent oil producer, slid 181.89 rubles, or 16 percent, to 930.57 rubles at 10:40 a.m. in Moscow.

``Another big collapse in the U.S. market, a weak opening in Asia and the deterioration of global market confidence will provide for another very testing and weak session today,'' Chris Weafer, chief strategist at UralSib Financial Corp. in Moscow, said in a note to investors.

The Micex Index fell 101.47 points to 643.29, heading for a sixth-straight day of declines.

To contact the reporter on this story: Alex Nicholson in Moscow at anicholson6@bloomberg.net.

Last Updated: October 8, 2008 02:46 EDT