A natural gas explosion destroyed three homes in Baltimore, killing one woman and trapping others.
Four people have been taken to hospital with serious injuries, and rescuers are trying to reach at least another survivor in the wreck.
The blast opened a fourth-row house and shattered windows around the neighborhood.
The Baltimore Gas and Electric Company has been called in to shut off gas around the immediate vicinity.
It was not immediately clear what caused the explosion, but piping leaks are a growing problem in Baltimore.
The facility estimated that replacing the old pipes would cost nearly $ 1 billion and take two decades.