Dallas police said a man has fatally shot his boss and killed himself inside an office building Monday.

The shooting unfolded on the seventh floor of the tower, located by the Lyndon B. Johnson Freeway, Fox 4 reported.

SHOOTING SCENE- Office bdlg..LBJ Frwy near Coit. Window busted out on 7th floor. Police, fire all around. pic.twitter.com/3BPsR7AW1L — Dionne Anglin (@DAnglinFox4) April 24, 2017

Officers told Fox 4 that they had to use a shotgun to get through the glass door in the office where the shooting was located. Inside they found a man and a woman dead.

Workers evacuated the building as SWAT team officers responded, the news station added. The building was later deemed safe by police but an officer was injured by debris, the Dallas Police Dept. said.

SWAT team has arrived at the scene. 8390 LBJ Freeway; reports of 2 shot https://t.co/8pUoS3ERJQ pic.twitter.com/K0qIojzoFr — FOX 4 NEWS (@FOX4) April 24, 2017

"I was on the phone with a customer, we heard shots," a woman who was working in the building told Fox 4. "My boss directed everybody to get in a corner and get down low."

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The worker said "people started screaming" and a SWAT team burst into the office, telling everyone to get out.

"They had guns pointed and everybody had to come out of the office with our hands up," she said.

Assistant Police Chief Randy Blankenbaker said that they won't release the identities of those who died until relatives are notified. He said they also are not yet saying what kind of office they worked in.

Blankenbaker said that the man was a current worker in the office. He says that there were witnesses to the shooting who were not injured.

At least one window at the tower was broken.

Two ambulances rushed to the tower, KTVT reported.

Click for more from Fox 4.