Lehigh Southwest Cement Plant employees returned to work after a week following a deadly shooting rampage there last month involving a disgruntled truck driver who shot nine people and killed three. The company announced that workers at its Permanente plant are returning to work and that the plant is open for business. The shooting occurred at the Lehigh Southwest Cement Plant last month. On that day, Shareef Allman, 49, of San Jose, opened fire on about 15 other employees gathered at a meeting. A day after the shooting, sheriff’s deputies shot and killed Allman. Counselors are stationed at the cement plant to assist employees.