MILWAUKEE—A worker shot and killed two colleagues at a supermarket distribution center near Milwaukee before crashing his vehicle during a police pursuit and then killing himself, a union official and police said Wednesday. The attacks happened Tuesday night at the Roundy’s distribution center in Oconomowoc, about 30 miles west of Milwaukee, said Thomas Bennett, secretary-treasurer of General Teamsters Local Union No. 200. He said all three men were in their 40s. Oconomowoc police said the suspect’s vehicle was spotted in Milwaukee after the attack and officers began to pursue it. The vehicle crashed and the suspect was pronounced dead at the scene from a self-inflicted gunshot wound, according to officials. Union stewards said the two men were shot in different areas of the massive warehouse, according to Bennett. One was shot in the loading dock and the other was shot in an upper area of the facility. Bennett said he …