Thailand's military courts have issued long sentences for two people convicted of insulting the monarchy on Facebook.

The watchdog group iLaw said Bangkok Military Court sentenced Pongsak Sriboonpeng, from the capital, to 60 years, 10 for each message, but halved his sentence because he admitted wrongdoing.

A mother of two young girls in the northern province of Chiang Mai was also found guilty of posting offensive Facebook comments, but had her cumulative sentence halved to 28 years after pleading guilty.

Thailand's lese majeste law mandates prison terms of three to 15 years for defaming, insulting or threatening the monarchy.

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