People walk along frozen Chicago River in downtown Chicago, the United States, Jan. 4, 2018. After embracing the coldest day this winter on the New Year's Day, Chicago continued staying in cold and chill. The winter storm that is slamming U.S. East Coast leads to more than 200 flight cancellation in Chicago on Thursday morning. Most of the flights cancelled have East Coast destinations, a statement of the aviation department said. (Xinhua/Wang Ping)