According to KDFW-TV, the man repeatedly rammed his pickup into a portion of the building with floor to ceiling windows, then got out of his vehicle and started ranting.
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Emergency responders were called to the scene at about 6 a.m.
Dispatcher audio recorded, "We believe it is intentional. He is purposefully ramming his vehicle now."
Police are investigating a suspicious bag the man reportedly left at the scene as well, KDFW reports.
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The TV station says most of their employees were evacuated from the building.
Authorities said it does not appear that the suspect was targeting the media and that the suspect had strewn papers around the outside of the building with information about an officer involved shooting that happened in another city.
Streets around the building were shut down to traffic during the investigation.