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* Chip stocks tumble on TSMC's weak industry outlook
* P&G, Philip Morris weigh on consumer staples sector
* AmEx jumps after strong results
* Financials gain as bond yields rise
* Indexes down: Dow 0.5 pct, S&P 0.79 pct, Nasdaq 0.87 pct
By Sruthi Shankar
April 19 (Reuters) - U.S. stocks fell on Thursday, as technology stocks from Apple to chipmakers declined following a weak forecast on smartphone demand, while a sharp drop in Philip Morris's shares after results weighed on the consumer staples sector.
A warning from Taiwan Semiconductor (TSMC), the world's largest contract chipmaker and Apple supplier, on soft demand for smartphones and on the semiconductor industry's growth this year sparked a tumble in chip stocks.
Apple's shares also fell 2.4 percent, with analysts telling Reuters that TSMC's warning was related to the iPhone maker. Apple was the biggest drag on the Dow Jones Industrial Average and the Nasdaq.
TSMC's U.S.-listed shares fell 5.8 percent. Intel declined 3.1 percent, falling the most on the Dow. All the stocks on the Philadelphia SE semiconductor index were in the red, with the index itself tumbling 3.9 percent.
"The broader tech weakness that you're seeing is out of weak guidance that's impacting Apple and the semiconductor space," said Michael Hans, chief investment officer at New York City-based Clarfeld Financial Advisors.
The only bright spot was the financial sector, which was up 1.2 percent, supported by American Express shares and a rise in 10-year Treasury yields to a near two-month high.
"We've seen considerable rise in rates and a steepening of the yield curve and that's been really benefiting the financials," Hans said.
The S&P consumer staples sector declined 3.5 percent as Philip Morris plunged 16.5 percent after the tobacco company's weak results and forecast.
Philip Morris was the biggest drag on the S&P 500 and also dragged Altria down 7.8 percent.
Procter & Gamble also dropped 3.2 percent after the Dow component said shrinking retailer inventories and higher commodities and transportation costs squeezed its margins.
At 12:42 p.m. ET, the Dow was down 0.50 percent, at 24,623.67. The S&P 500 fell 0.79 percent to 2,687.12 and the Nasdaq Composite dropped 0.87 percent to 7,231.51.
AmEx jumped 6.2 percent after the credit card issuer topped Wall Street profit estimates.
"What's happening in this season is even if you meet (profit expectations), that's not good enough, you've got to beat convincingly," said JJ Kinahan, chief market strategist at TD Ameritrade in Chicago.
Of the 52 companies among the S&P 500 that have reported first-quarter earnings through Wednesday, 78.8 percent topped profit expectations, according to Thomson Reuters data.
Declining issues outnumbered advancers by a 2.56-to-1 ratio on the NYSE and by a 1.70-to-1 ratio on the Nasdaq.
The S&P index recorded 23 new 52-week highs and 14 new lows, while the Nasdaq recorded 82 new highs and 40 new lows. (Reporting by Sruthi Shankar in Bengaluru; Editing by Shounak Dasgupta)