The upbeat mood in a busy Chicago neighborhood known for its restaurants and nightlife quickly turned into horror late Wednesday as shots were fired at a crowd from a fast-moving vehicle, killing four people.

Four people were killed and 14 others wounded in a mass shooting Wednesday night in Chicago, police said. The carnage erupted in the River North neighborhood, on the 300 block of West Chicago Avenue, when a vehicle pulled up to a location and at least one gunman opened fire on a crowd standing outside.