February 11, 2019 10:25 am Bob Ross Flash Mob Middle school students had a art class on Thursday with no mistakes, just happy little accidents. KRBC’s Jessica Ranck reports. US & World Videos 4:17 Police presence grows at pro-Palestinian encampment at Northeastern 5:39 Billerica police sergeant hit and killed by excavator during construction detail 2:31 Celtics preparing for pivotal Game 3 against Heat in Miami 2:37 Quincy detective resigns amid allegations of ‘unwelcome, sexually explicit conduct' 4:07 Officer hit and killed while working construction detail in Billerica, authorities say