February 26, 2016 5:55 pm The Pearl Affair: Largest Mass Escape Attempt of the Underground Railroad Historian C.R. Gibbs tells the story of the Pearl Affair, the attempt of more than 70 slaves to escape to freedom via the Potomac River. Local 1:37 Pro-Palestinian protesters gather outside White House correspondents' dinner 0:43 American University locked down before man arrested on campus 3:08 Family holds memorial for brothers, 3 and 6, who died after Clifton house fire 2:05 ‘People immediately hit the ground': 6 hurt in shooting outside DC nightclub 2:20 Driver accused of deadly hit and run of skateboarder held without bail