Three workers have been injured in a gas line explosion at a high school in the Marble Hill section of Manhattan in New York City.
According to The New York Times, one of the seven workers who were working on a construction project in a science laboratory at John F. Kennedy High School, has been critically injured, said authorities.
The workers were draining gas from a main in the lab before starting their work but failed to drain it completely, setting off the blast, the police said.
Witness and officials said that the force of the explosion blew out windows on the sixth floor and shook a nearby apartment building.
The police said that the blast "heavily damaged" the fourth, fifth and sixth floors of the building, but that no serious fire lingered after the initial explosion.
The three injured workers were all male and were rushed to Jacobi Medical Center immediately.
