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.
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The pair, including a man in his 50s, were struck around midday on the Pen y Fan mountain range in Powys, mid-Wales.