* Apple drops 1.6 pct after Goldman Sachs warns on China demand
* BofA down 2 pct despite quarterly profit beat
* Sears falls after filing for bankruptcy
* L3 Technologies, Harris Corp lead S&P 500 on merger news
* Indexes slip: Dow 0.2 pct, S&P 0.5 pct, Nasdaq 1 pct (Updates to open)
By Medha Singh
Oct 15 (Reuters) - U.S. stocks fell on Monday as an increase in tensions between Western powers and Saudi Arabia added to worries over rising borrowing costs and the impact of tariffs, following the main three indexes' biggest weekly declines in over seven months.
Among the biggest drag on the three major indexes was Apple , which fell 1.6 percent after Goldman Sachs said there were multiple signs of rapidly slowing consumer demand in China, which could affect demand for iPhones this fall.
Apple's drop weighed on technology stocks, which fell 1.34 percent and much like last week, led the market lower. The gainers among the 11 major S&P sectors were led by the defensive utilities, real estate and consumer staples companies.
With the third-quarter earnings season entering high gear this week, Goldman's warning on weak demand from China would only add to fears about the impact of the U.S.-China trade war on corporate profits.
Also adding to the tensions was U.S. President Donald Trump's threat of "severe punishment" if it was found journalist Jamal Khashoggi, who disappeared on Oct. 2, was killed in the Saudi consulate in Istanbul. Saudi Arabia has vowed to retaliate to any move to punish the Kingdom.
"We've entered a volatile and erratic phase in the market, primarily driven by accelerating rate concerns," said Andre Bakhos, managing director at New Vines Capital LLC in Bernardsville, New Jersey.
"And the Saudi situation adds to this volatility."
The clearest picture yet of the impact of the U.S.-China trade war will be the third-quarter earnings season, especially the company forecasts. Profits at S&P companies are expected to have risen 21.5 percent, according to I/B/E/S data from Refinitiv, less than the growth in the past two quarters.
"It's more about what picture the corporate heads are going to paint instead of the numbers themselves," said Bakhos.
At 10:09 a.m. EDT the Dow Jones Industrial Average was down 55.80 points, or 0.22 percent, at 25,284.19, the S&P 500 was down 13.21 points, or 0.48 percent, at 2,753.92 and the Nasdaq Composite was down 71.26 points, or 0.95 percent, at 7,425.63.
The S&P 500 retailers index dropped 1.14 percent after data showed U.S. retail sales barely rose in September, as a rebound in motor vehicle purchases was offset by the biggest drop in spending at restaurants and bars in nearly two years.
Bank of America gave up earlier gains to trade 2 percent lower, despite posting a better-than-expected quarterly profit, boosted by lower costs, higher interest rates and lending growth.
L3 Technologies rose 10.2 percent and Harris Corp climbed 9.0 percent after the military communication equipment providers announced an all-stock merger on Sunday, to create the sixth-largest defense contractor in the United States.
Sears Holdings plummeted 16.3 percent after the retailer filed for Chapter 11 bankruptcy, throwing into doubt the future of the company which has withered in the age of internet shopping.
Advancing issues outnumbered decliners for a 1.04-to-1 ratio on the NYSE and a 1.28-to-1 ratio on the Nasdaq.
The S&P index recorded no new 52-week highs and six new lows, while the Nasdaq recorded 10 new highs and 67 new lows. (Reporting by Medha Singh in Bengaluru; Editing by Shounak Dasgupta)