US crude futures end down 9.46 pct on OPEC,Wall St

NEW YORK, Dec 1 (Reuters) - U.S. crude oil futures slumped 9.46 percent on Monday after OPEC decided at a weekend meeting to defer any further output cut until at least mid-December.

U.S. manufacturing activity fell to its lowest level since 1982, according to an industry report, and holiday shopping worries also pressured Wall Street, which swayed the oil markets.

On the floor of the New York Mercantile Exchange, January crude CLF9 settled down $5.15 at $49.28 a barrel, trading from $49.05, the lowest since $48.80 was hit on Nov. 24, to $54.62. (Reporting by Gene Ramos)