Workers fled the office of a Baltimore television station Tuesday morning after a vehicle smashed through the front entrance, and the possibly armed driver was unaccounted for, Baltimore County police said.
Police shut down roads in the Towson community near ABC-affiliate WMAR-TV, ordered the nearby St. Pius X School to enter a lockdown and advised people in the area to use social media with caution.
There were no reports of injuries. The station's reporters said on Twitter that the vehicle was a dump truck or a landscaping truck.
Police said the first call to 911 was made at 11:45 a.m., reporting that a man was banging on the station's door trying to get in. Minutes later, the station called 911 again. This time, the man had brought the truck into a lobby.
A photo from the scene suggested the truck escalated a short staircase, barged through a set of doors and came to rest in a lobby. One reporter said multiple attempts were needed to break through the entrance.
The station reported the man may have barricaded himself in the building, prompting a SWAT team search of the premises that continued Tuesday afternoon.
The E.W. Scripps Co., which owns WMAR-TV, lists the affiliate as the 11th commercial television station to ever be created.