Postal Service allegedly assaulted his co-worker with a metal pipe last week during a dispute at a distribution center in Southwest Philly, federal prosecutors said. The alleged attack happened around 5 a.m. on July 21 in the USPS facility at 7500 Lindbergh Blvd. A witness told investigators that Louis swung the 56-inch-long pipe at his co-worker and struck him in the chest. Louis allegedly struck the man a second time in the head, knocking him unconscious. A bystander intervened to take the pipe from Louis and notified USPS management of the assault, investigators said.