At least six people were shot dead Tuesday night inside a Walmart in Chesapeake, Virginia, in an attack that unfolded within an hour of the store’s scheduled closing time, city officials said early Wednesday.Investigators believe the shooter was an employee or former employee of the store who opened fire on other employees in a break room, a law enforcement source told CNN.Officers responded to the Walmart around 10:12 p.m. – less than an hour before it was set to close – and found victims and evidence of a shooting, Kosinski said.At the University of Virginia in Charlottesville – which is about 170 miles west of Chesapeake – a 22-year-old student allegedly opened fire on fellow students this month, killing three of them on a bus returning to campus from a field trip to Washington, DC.Last weekend, a 22-year-old shot and killed five people at an LGBTQ nightclub in Colorado Springs, Colorado, and 19 others were injured, authorities said."