May 3, 2014 9:44 am Building Collapse Investigation Begins Investigators are on the scene where three buildings collapsed Friday afternoon in northwest D.C. Local 2:17 Family remembers woman allegedly killed by boyfriend 1:44 Maryland man killed in North Carolina days before college graduation 2:23 Michelle Obama surprises DC high school students celebrating College Signing Day 2:00 Rider spotted clinging to back of Metro train 1:55 100-year-old Vietnam vet finally receives his college diploma