The ministries' gates have been closed. Some are heading to other ministries.
At the Commerce Ministry, all gates are closed, while permanent secretary Srirat Rastapana said in a statement that all 4,000 officers inside the premise would be protected.
The Department of Special Investigation (DSI) office, part of the Government Centre on Chaeng Wattana Road, has been closed for outsiders.
Some were also seen in front of PTT headquarters on Vibhavadi-Rangsit Road.