(Updates White House no comment, background, paragraphs 2-3)

WASHINGTON, Sept 6 (Reuters) - The United States would not comment on Thursday on Syria's accusation that Israel bombed its territory.

"We have no comment to offer at this time," White House spokesman Tony Fratto said.

Syria accused Israel of "aggression and treachery," and said bombs were dropped on an empty area where there were no reports of casualties or damage. Israel declined to comment.

U.S. State Department spokesman Tom Casey said he had seen news reports of Syria's charge against Israel, but said he had nothing to substantiate them.

"I have seen press reports of Syria claiming one thing and Israel denying it," said Casey. "I don't want to comment on what at this point in time is speculation."

"I'm not going to speculate on stories that as far as I know don't have any basis in fact," he said.

Asked whether the United States had asked either Israel or Syria for their version of events, Casey said he was not aware of any U.S. contacts with either government on the issue.

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