
A source said officials interviewed motorists and passengers of vans about their destinations at various checkpoints.
So far, there have not been any reports of any group being stopped from travelling by the officials.
Other sources said military officials have talked to several local red-shirt leaders in Mae Sot, Mae Ranad and Muang districts but they said they had distanced themselves from politics so they would not travel to Bangkok.
But one source said five or six red-shirt leaders had already gone to Bangkok on their own.