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(CNN)One woman died and three people were hospitalized in serious condition after a major explosion in a residential area of Baltimore, according to Blair Adams, Public Information Officer for the Baltimore City Fire Department.
Three homes were reduced to rubble in a major gas explosion, Adams said.
Officials are investigating the cause and crews are searching for people who might be trapped inside. Overhead video of the scene showed first responders searching through the rubble.
"It's a labor-intensive rescue," Adams said. "You have homes that were pretty much crumbled ... a ton of debris on the ground, so we're pulling and trying to comb through to see if we can find any additional occupants."
Three people have been rescued by firefighters, the Baltimore Firefighters IAFF Local 734 said, and the Baltimore Special Rescue Operations Team has begun search and rescue operations.
Baltimore City medical units and Baltimore County Fire Department units also have been called to the scene.
James E. Bentley, the Baltimore City Mayor's spokesman, told CNN he is aware of the reports and was headed into a meeting about the situation.
