Hungarian inspectors arrived at a BYD factory being built in the country on Tuesday, a source said, a day after the country’s prime minister, Peter Magyar, announced an investigation into the Chinese carmaker’s investment in Hungary.Authorities were focused on checking the papers of workers at the factory in Szeged, Hungary’s third-largest city, the source said, including their residency permits, social security cards, contracts and other legal documents.The Prime Minister’s office in Budapest...