Shares of some top oil companies were down at the close of trading:

BP PLC fell $.57 or 1.2 percent, to $48.97.

Chevron fell $3.29 or 2.5 percent, to $129.24.

ConocoPhillips fell $2.13 or 2.5 percent, to $82.50.

Exxon Mobil Corp. fell $4.31 or 4.2 percent, to $98.94.

Marathon Oil Corp. fell $.91 or 2.3 percent, to $38.75.