by david shepardson and ben blanchard washingtonbeijing china has agreed to cut tariffs on usbuilt cars and auto parts to 15 percent from the current 40 percent a trump administration official said on tuesday setting the stage for a new talks aimed at easing the bitter trade war between the worlds two largest economies washington still had not received documentation nor timing details of the tariff reduction the official said speaking on condition of anonymity chinas plan was communicated during a phone call between chinese vice premier liu he us trade representative robert lighthizer and treasury secretary steven mnuchin on tuesday morning beijing time the official said advt news of the move also reported by other media outlets and automotive executives briefed on the talks boosted automakers shares and helped lift us shares more broadly before worries about a us government shutdown prompted a pullback meanwhile uschina tensions over the canadian arrest of a top executive at chinese telecoms giant huawei technologies hwtul appeared to rise as canada confirmed that one of its citizens had been detained in china canada said there was no direct link to the huawei case but two sources said the us state department was considering a travel warning of risks to us citizens in china due to retaliation over the huawei case trade truce scant details us president donald trump and chinese president xi jinping agreed at a dec 1 meeting in argentina to a truce that delayed by 90 days a planned jan 1 us increase of tariffs to 25 percent from 10 percent on 200 billion worth of chinese goods but few details of plans for talks have emerged since then the two sides are expected to negotiate over us demands for stronger chinese protections for us intellectual property an end to forced technology transfers and greater market access to china for us companies lighthizer has said march 1 is a hard deadline for increasing us tariffs on chinese goods if no deal can be reached by then advt trump without providing details wrote in an early morning post on twitter very productive conversations going on with china watch for some important announcements white house adviser kellyanne conway welcomed reports of the auto tariff cut its really great news and i hope our friends in the auto industry see it that way as well she told reporters at the white house officials at the us treasury and us trade representatives office declined to provide details of the trade call chinas commerce ministry said both sides exchanged views on putting into effect the consensus reached by the two countries leaders at their meeting and pushing forward the timetable and road map for the next stage of economic and trade consultations work tariff cut increase cut china had cut its global auto import tariff to 15 percent from 25 percent in may but in july added on a punitive 25 percent tariff on usproduced autos in response to an initial round of us tariffs on