The incident in Khan Younis came amid growing tensions between the Hamas-led government and President Mahmoud Abbas' Fatah movement. The broadcast authority is controlled by Abbas.
About 15 gunmen fired in the air as they entered the building. "You are collaborators. You are biased. You are dirty people," they screamed, according to the workers.
The gunmen expelled employees from the building, beat up a cameraman and fired their weapons at cameras and other equipment, the witnesses said. They left the building after several minutes, the AP reports.
Employees later staged a half-hour strike to protest the building's takeover.
The facility is used to transmit signals for state-run television and radio broadcasts.
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