Montgomery County August 18, 2019 11:05 am Harmful Toxin Discovered in 2 Montgomery County Lakes A toxic substance found in two Montgomery County lakes is harmful to pets and people. News4’s Derrick Ward has the story. Local 3:28 Social media and teens' mental health: A psychiatrist weighs in 1:41 DC-area police ramp up traffic enforcement in pedestrian safety campaign 3:05 ‘We need real liberation': George Washington University pro-Palestinian protest enters fifth day 2:17 GW asks to students to move pro-Palestinian demonstration 3:01 “It's 100% different”: Community reflects on emergency curfew at National Harbor