U.S. stocks moved broadly lower in midday trading Friday, on course for another losing week, according to AP. Disappointing quarterly results from several companies and increased worry that China's economy is slowing weighed on the market. Health care and materials stocks were among the biggest decliners. The Dow Jones industrial average fell 97 points, or 0.6 percent, to 17,634 as of 12:28 p.m. Eastern Time. The Standard & Poor's 500 index slipped 10 points, or 0.5 percent, to 2,091. The Nasdaq composite lost 12 points, or 0.2 percent, to 5,133. Stocks kicked off the week on a strong note, driving the Nasdaq to its latest record high and brining the S&P 500 close to a new milestone of its own. But it's been downhill since then. The Dow fell into negative territory for the year on Thursday. If Friday's losses hold, the S&P 500 will have had its fourth losing week out of the last five. Amazon surged 15.4 percent a day after the e-commerce pioneer reported a surprise profit. The stock rose $74.21 to $556.39. Starbucks also served up strong earnings late Thursday. Its shares were up $1.23, or 2.2 percent, to $57.79. Germany's DAX was down 1.4 percent, while the CAC-40 in France slipped 0.6 percent. The FTSE 100 index of leading British shares fell 1.1 percent. In Asia, China's Shanghai Composite Index sank 1.3 percent. Japan's Nikkei 225 fell 0.7 percent. Australia's S&P/ASX 200 fell 0.4 percent. Benchmark U.S. crude was down 43 cents to $48.02 a barrel in New York. Brent crude was down 84 cents at $54.42 a barrel on the ICE futures exchange in London. U.S. government bond prices were little changed. The yield on the 10-year Treasury note held steady at 2.27 percent.