Dutches County, NY – [UPDATED INFO BELOW] A gunman was holding a school principal hostage Tuesday at a school in Pine Plains, New York, about 90 miles north of New York City, police and the town supervisor told the media.

Police have the gunman contained to a room at Stissing Mountain High School and are negotiating, said Pine Plains Town Supervisor Gregg Pulver.

Pulver said he believed the gunman is a parent.

It was not clear whether the principal was from the high school or middle school, which are in the same building.

Pulver said he first heard about the gunman around the time the school opened at 7:45 a.m. It is unclear how many people were in the school at the time, but he said around 600 people — 500 children and 100 staff members — are usually at the school.

The New York State Police were at the scene along with the Dutches County Sheriff’s Department SWAT team and members of the Pine Plains Police Department.

In all, Pulver said, about 100 police officers were at the scene.

UPDATE FROM WCBSTV: New York State police say a person is in custody in the hostage situation at a New York high school. A town official says the gunman who held a school administrator hostage at Stissing Mountain High is an adult former student.

Police had him confined to one room and all the students are safe after the dramatic incident. He was taken away from the school by police just after 10 a.m. Pine Plains Town Supervisor Gregg Pulver said the gunman is a man in his 40s.

(Source: CNN / WCBSTV)