** Shares of automakers fall premarket after U.S. President Donald Trump imposed new tariffs of 25% on goods from Mexico and Canada and 10% on imports from China, raising concern over possible duties on EU imports too

** U.S. automakers General Motors GM.N and Ford F.N down 7.5% and 4.3%, respectively

** Electric vehicle maker Tesla TSLA.O falls 2.9% to $392.84; Rivian Automotive RIVN.O slips 3.8% to $12.08

** Shares of some of biggest European carmakers fall, with pan-European STOXX automobiles and parts index .SXAP slipping 4.4% to more than two-week low; wider STOXX 600 .STOXX index down 1.4%

** Stellantis STLAM.MI and Volkswagen VOWG_p.DE, which have major operations in Mexico and are particularly vulnerable to tariffs, were down 7.6% and 6.7% respectively

** Volvo Cars VOLCARb.ST down 7.6%

** Mercedes Benz MBGn.DE, BMW BMWG.DE and Porsche P911_p.DE fall between 4.1% and 5%

** French car parts supplier Valeo VLOF.PA falls 8.3%

** In Japan, Toyota 7203.T has experienced similar decrease of 5%

** Tariffs are due to take effect at 0501 GMT on Tuesday

(Reporting by Sanchayaita Roy in Bengaluru)

((Sanchayaita.roy@thomsonreuters.com))