ETFs related to oil services were higher after BP ( BP) said it was stopping production at Prudhoe Bay in Alaska to repair a pipeline leak. The shutdown removes up to 400,000 barrels a day from the world's supply.

The S&P Oil & Gas Exploration & Production ( XOP) ETF was gaining 13 cents, or 0.3%, to $39.87, the Oil Services HOLDRs ( OIH) ETF was tacking on a penny at $140.06, and the iShares Dow Jones U.S. Oil Equipment Index ( IEZ) was recently higher by 4 cents to $45.67.

A rise of nearly 1% in the price of gold supported the streetTRACKS Gold Shares ( GLD) ETF, which was up 39 cents, or 0.6%, to $64.67, and the iShares COMEX Gold Trust ( IAU), higher by 45 cents, or 0.7%, to $64.81.

Meanwhile, products tracking the semiconductor sector were lower after Prudential cut its earnings and revenue estimates for chipmaker Intel ( INTC) on the belief that demand for the company's Core 2 Duo chip will be softer than expected.

The PowerShares Dynamic Semiconductors ( PSI) ETF was falling by 0.8% to $15.73, the iShares Goldman Sachs Semiconductor ( IGW) ETF was down 0.8% to $54.92, and the Semiconductor HOLDRS ( SMH) was losing 0.7% to $31.06.

The B2B Internet HOLDRs ( PSJ) ETF was another weak performer as holdings Ariba ( ARBA) and Checkfree ( CKFR) were off 2% or more. The B2B Internet HOLDRs was lower by 4 cents, or 2%, to $1.99.