March 6, 2018 11:38 am Social Media Threat Locks Down Md. High School Prince George’s County police are investigating a threat that was made against a high school Tuesday morning. News4′ Tracee Wilkins has more. Local 22:10 Voters head to the polls for Maryland primary: The News4 Rundown 2:27 A cyberattack temporarily shut down Metro's website last week 2:12 Northern Virginia police investigating 3 hit-and-runs, 2 fatalities 2:06 NTSB releases initial report 49 days after Key Bridge collapse 1:57 FBI warns of scam targeting local Chinese communities