US doctor kills building manager after long-running dispute over mould, police say

A Washington DC physician fatally shot his apartment building's manager and wounded four others before taking his own life following a prolonged disagreement over maintenance problems at his residence. The shooter, 55-year-old Dr. Matt Wade Lambert, initiated the attack inside a gym located in his Logan Circle apartment complex, then retreated to his seventh-floor unit where he fired at additional victims from his balcony and exchanged gunfire with responding officers. Investigators discovered three firearms and containers of flammable materials in his apartment, suggesting the incident involved advance preparation.