Two FDNY firefighters were burned while responding to a fire in Brooklyn, which was caught on video, and are in serious condition.

More than 100 firefighters and emergency crew officials responded to a two-alarm fire on Monday morning in Brooklyn in the Crown Heights neighborhood, according to The Associated Press.

FDNY said five firefighters were injured, including one with severe burns on nearly half of his body currently at Cornell University Medical Center. Another firefighter was seriously hurt while the other three sustained minor injuries.

According to the New York Post, the firefighter was searching for people in the building when the third floor went up in flames. He was reportedly pulled to safety, while covered in flames, out of a third floor window of the brownstone by another firefighter and taken down a truck ladder.

A video taken by a witness, uploaded to YouTube, shows the firefighter being rescued.

One firefighter appeared at the window with heavy fire and he escaped down the ladder. He was the most seriously injured, FDNY deputy assistant chief Edward Baggott said in a statement.

Fire Department officials said the man is being treated at the William Randolph Hearst Burn Center for burns on his head, face, hands and arms.

At this time it does not appear to be life-threatening, fire spokesman Frank Dwyer told The New York Times. They are talking, they are alert. But they're in a lot of pain, and they have a long road of recovery ahead of them.

The fire was put out in about an hour, according to FDNY officials, and the cause is unclear.