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The BUK missile system blamed for shooting down flight MH17 over east Ukraine, killing all 298 people on board, is an anti-aircraft weapon whose origins date back to the Soviet era. BUK -- which means "Beech" in Russian -- first fully entered service with the Red Army in 1980, and has been exported to many countries, including North Korea and Syria. Up to six BUK missiles can be fired simultaneously from a launch vehicle -- usually either a military truck or a tank -- on targets flying on different bearings, according to the London-based Jane's defence and intelligence group.
Chevron climbed 2.5 percent and Exxon Mobil gained 4.66 percent. At 2:22 pm ET, the Dow Jones industrial average was up 0.38 percent to 18,297.06 points and the S&P 500 had gained 0.29 percent to 2,166.1. The Nasdaq Composite added 0.07 percent to 5,309.31.