BEIJING, April 4 (Reuters) - Shanghai base metal prices mostly fell on Wednesday after the United States announced fresh tariffs on 1,300 Chinese products, including some metal products, escalating a trade row with China, which has vowed to respond. FUNDAMENTALS * SHFE COPPER: The most-traded May copper contract on the Shanghai Futures Exchange, which has risen for five trading days in a row, was flat at 50,410 yuan ($8,019.28) a tonne by 0154 GMT. * LME COPPER: Three-month copper on the London Metal Exchange was up 0.2 percent at $6,810.50 a tonne, extending a 1.2 percent gain in the previous session. * OTHER METALS: The four other key base metals in Shanghai were all in negative territory amid trade war fears, led by zinc , which was down 1 percent at 24,660 yuan a tonne, while aluminium and lead were both down 0.5 percent. * UNITED STATES: The Trump administration on Tuesday raised the stakes in a growing trade showdown with China, announcing 25 percent tariffs on some 1,300 industrial technology, transport and medical products to try to force changes in Beijing's intellectual property practices. * TRADE: China's commerce ministry said on Wednesday it "strongly condemns and firmly opposes" the proposed U.S. tariffs following the Section 301 probe and will take counter measures, according to the official Xinhua news agency. * CHINA: China's services sector growth eased to a four-month low in March as new business and employment grew at a slower rate, a private business survey showed, pointing to cooling demand in a sector Beijing is counting on to maintain economic growth. * CHILE: Caserones copper mine in Chile said on Tuesday that it would temporarily shut down its copper concentrator in order to replace a leaking pipe. * LITHIUM: Representatives of Chinese lithium giant Tianqi met with Chile's top anti-trust prosecutor less than a month after Chilean authorities moved to block the miner from buying a coveted stake in Chile's SQM, Chile's lobbyist transparency website showed on Tuesday. * ALCOA: Aluminium producer Alcoa Corp said on Tuesday it had signed contracts to transfer Canadian pension obligations and assets worth $555 million to three insurers, in a move to strengthen its balance sheet.