Witnesses say a group of Palestinian policemen firing in the air took over the parliament building in Gaza City Monday.
Eyewitnesses say about 30 policemen entered the compound and closed the gates behind them. Some policemen were seen taking up positions on the roof.
It was not immediately clear why they took over the building.
Last week, Palestinian police and Fatah party activists held protests across the West Bank and Gaza Strip following the defeat of the long-dominant Fatah faction by the militant Hamas group in Wednesday's parliamentary elections.
Protesters demanded that Fatah leaders resign, and also warned against allowing Hamas to take control of Palestinian security forces.
Some information for this report was provided by AP and Reuters.