Thailand's justice minister Chaikasem Nitisiri said the army had not consulted the cabinet on their decision to impose martial law, but appeared to play down the move, saying it was "only taking over security" and it would not affect the cabinet.
Protest leader Jatuporn Prompan said his group would accept the imposition of martial law, but "won't tolerate a coup or other non-constitutional means" to grab power.
More top news
The High Court has ruled the prison segregation of two terrorists was unlawful although it rejected claims their human rights were abused.
Michel Platini has formally announced that he intends to stand for the Fifa presidency when Sepp Blatter vacates the position
Microsoft's new system Windows 10 has been met with approval after its disastrous predecessor but users have yet to be entirely convinced.