The pro-democracy campaigners are among the few activists that have dared to publicly challenge Thailand's military rulers, who imposed severe curbs on civil liberties after seizing power from an elected government last year.
Their arrests yesterday followed a peaceful protest calling for an end to junta rule a day earlier at Bangkok's Democracy Monument, where spirited speeches and songs were met with claps and cheers from dozens of supporters.
The 14 activists -- university students in their 20s including one woman -- were taken to a remand prison in northern Bangkok in the early today, Colonel Chumphol Chanchanayothin, superintendent of a police station in the capital's old quarter, told AFP.
They were each charged with "violating national security", he told AFP, an offence under section 116 of Thailand's criminal code that carries up to seven years in jail. Lawyers for the activists and rights groups have described the charge as "sedition".
More From This Section
After the charges were filed the activists were taken to Bangkok's military court late yesterday, which was surrounded by scores of their friends and supporters, Kunthika Nutcharut, part of the legal team representing the students, told AFP.
"They refused bail as they don't recognise the authority of the military court," she said.
Speaking to reporters today, Army Chief Udomdej Sitabutr issued a firm warning to any supporters of the detained activists in comments that just stopped short of threatening further arrests.
The 14 students belong to groups that have staged small but symbolic acts of anti-coup protest including raising the three-fingered salute from "The Hunger Games" films or publically reading George Orwell's anti-authoritarian novel "Nineteen Eighty-Four" -- actions that have triggered arrests.