RAW Helicopter footage: Demolition crews break down exploded Dallas apartment complex

Eight people were injured Wednesday in an explosion at an apartment building in southern Dallas, including four Dallas firefighters and four others who are in critical condition, officials said. As of Thursday morning, one firefighter and four other people have been released from the hospital.

The three firefighters are still being treated for their injuries. The firefighters were responding to a report of a natural gas leak at the apartment building when the explosion happened.