VIDEO: Baltimore City firefighters are on the scene of a major gas explosion at Labyrinth and Reisterstown Road involving 3 homes. Baltimore Firefighters say 3 patients, all critical have been rescued by firefighters. Special Rescue Operations units have arrived and are beginning to search and rescue the other patients. Medic units have been called and units from Baltimore County firefighters have been called to help. A major explosion occurred near Reisterstown Road on Monday morning, according to reports. The Baltimore City firefighters union tweeted that several houses exploded and at least 5 people trapped, along with some children.