A military court late today approved arrest warrants for the 17, who are to hear the charges in court tomorrow. It is unclear how many are in custody.
The authorities have hinted, but not publicly stated, they are suspects in the attacks at seven tourist destinations.
Thai reporters were told by officials on an anonymous basis that the 17 had confessed to being in a previously unknown anti-government group called Revolution for Democracy but denied carrying out the attacks.
A search of the house of one of the 17 suspects turned up an AK-47 assault rifle, according to the anonymous sources, who released the names and home provinces of all of the suspects. Most are from the north and northeast, though all the attacks took place in southern provinces.
Col Winthai Suvaree, a spokesman for the country's ruling junta, said the detentions were unrelated to last week's attacks. He said without elaborating that the 17 were involved in a national security case.
The crime with which the 17 are being charged is membership in a secret society, punishable by up to seven years in prison. The crime, which is also called criminal association, was originally applied many decades ago to criminal gangs such as Chinese triads. Other charges can be lodged against them at a future time.
Information about the investigation of the attacks has been vague and contradictory. At various points, the authorities have said the attacks were similar to style to those carried out by southern militants; that they were acts of local sabotage rather than terrorism; and that a single figure known to them had directed them.
The website of the newspaper Khao Sod identified some of those being arrested as supporters of Thaksin or opponents of the military government.
Thaksin's supporters and opponents have since his ouster carried out a sometimes-violent struggle for power. The army in 2014 toppled an elected government that had been led by Thaksin's sister, Yingluck Shinawatra.
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