/ Source: The Associated Press
Shares of some top oil companies are down at 10 a.m.:
Chevron fell $.65 or .8 percent, to $85.44.
ConocoPhillips fell $.43 or .7 percent, to $62.46.
Exxon Mobil fell $.54 or .8 percent, to $71.29.
Marathon Oil fell $.18 or .5 percent, to $33.96.