More evidence of chemical weapons use in Syria needed: US

WASHINGTON (AFP) - The White House said Tuesday it needed more evidence before declaring formally that sarin gas has been used in Syria, after France expressed certainty that it was.

"We need to expand the evidence we have ... before we make any decision," spokesman Jay Carney said, alluding to President Barack Obama's stated position that use of the deadly nerve agent would be a "game-changer" for Washington.