After an investigation, authorities announced that a blaze in Riverdale last week that injured seven firefighters was started intentionally.
Prince George's Fire and EMS, together with Prince George's County police and officials from the Bureau of Alcohol, Tobacco, Firearms and Explosives, announced the finding of arson on Wednesday in a press conference.
The fire happened at a single-family, single-story home in the 6400 block of 57th Street in Riverdale.
Seven firefighters -- including Bladensburg volunteer Ethan Sorrell, 21, who was released from the hospital yesterday, and Kevin O'Toole, 22, who remains in intensive care -- were injured after a rush of air caused a fireball in the home.
Investigators said Wednesday the Friday blaze was the second one caused by arson in the past few weeks on the street. Although not previously reported, law enforcement identified another house on the same block that had also burned because of arson.
Police believe there is a tie between the fires. They did not immediately have a look-out for suspects.
Fire and EMS also mentioned there was a third arson fire on the street in 2008, which was attributed to teenagers.
Anyone with information about the fires should call Crime Solvers at 866-411-TIPS (8477) or submit tips online.