* Dollar broadly stronger, but euro pares loss * Protesters clash with authorities in Iran NEW YORK, Sept 18 (Reuters) - U.S. crude oil futures slipped on Friday as the dollar's strength and weaker global equities weighed even as protests in Iran helped keep the geopolitical risk premium associated with oil prices in focus. The dollar rose against most major currencies on Friday, clawing up from a one-year low against the euro as a lower risk appetite cut demand for higher-yielding currencies. [USD/] But the euro pared some losses near oil's open outcry floor session in New York, sources noted, helping crude oil futures pare losses. Global equities came under pressure after scaling an 11-month peak. [MKTS/GLOB] U.S. stocks opened slightly higher as investors sought to determine whether a pullback is on the horizon after a six-month rally and the market braced for options expiration. [.N] Iran security forces clashed with supporters of opposition leader Mirhossein Mousavi and arrested at least 10 of them during annual anti-Israel rallies in Tehran on Friday, a witness said. [ID:nHAF825799] "As we have repeatedly mentioned, the vagaries of the marketplace that affected direction before the current economic calamity are extant, particularly geopolitics, as events in Iran clearly demonstrate," Mike Fitzpatrick, vice president at MF Global in New York, said in a research note. Crude and refined products futures also have felt some pressure from high inventories, especially of products, which have also weighed on crack spreads. PRICES * On the New York Mercantile Exchange, at 10 a.m EDT (1400 GMT), October crude CLV9 was down 36 cents, or 0.5 percent, at $72.11 a barrel, in choppy trading from $71.27 to $72.66. * In London, November Brent crude LCOX9 was down 23 cents, or 0.32 percent, to $71.32 a barrel, trading from $70.51 to $71.75. * NYMEX October RBOB RBV9 fell 1.22 cents, or 0.66 percent, to $1.8390 a gallon, trading from $1.8220 to $1.8534. * NYMEX October heating oil HOV9 fell 0.37 cent, or 0.2 percent, to $1.8372 a gallon, trading from $1.8178 to $1.8484. * The October/October RBOB crack spread <0#RB-CL=R> was at $5.17, after ending at $5.28 on Thursday. The October/October heating oil crack spread <0#CL-HO=R> was at $5.04, after ending at $4.85 on Thursday. * The spread between the current front month and the five-year forward crude contract CLc61 was at $13.27, based on the October 2014 contract Thursday settlement at $85.38. The spread ended Thursday at $12.91. TECHNICALS NYMEX crude 10-day/20-day moving average: $70.83/$70.96 Technical support/resistance: NYMEX crude: $70.00/$75.00 NYMEX heating oil: $1.7856/$1.85 NYMEX RBOB: $1.82/$1.90 For a full report on technicals, click on [ID:nLI684769] MARKET NEWS * Copper fell while lead dropped more than 5 percent as more stock increases and the expectation of further declines in Chinese imports reinforced concerns metals prices had raced ahead of fundamentals. [ID:nLI459856] * The U.N. nuclear agency has no proof that Iran has or once had a covert atomic bomb program, it said on Thursday, dismissing a report that it had concluded Iran was on its way to producing nuclear weapons. [ID;nLH13317] * Global equities came under pressure on Friday after scaling an 11-month peak as investors took stock of recent hefty gains, giving the downtrodden dollar a reprieve and shoring up government bonds. [MKTS/GLOB]

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