LONDON (AP) — Politicians from Britain, Northern Ireland and the European Union have held talks to ease post-Brexit trade tensions that have shaken Northern Ireland’s delicate political balance. British Cabinet minister Michael Gove, European Commission Vice President Maros Sefcovic and the leaders of Northern Ireland’s Catholic-Protestant power-sharing government held a video conference about the problems that have erupted barely a month after the U.K. made an economic split from the 27-nation EU. Northern Ireland authorities have halted veterinary checks and withdrew border staff from Belfast and Larne ports after threatening graffiti appeared referring to port workers as targets. Pro-British unionists in Northern Ireland strongly oppose new customs checks that are a product of Brexit.