BANGKOK (AFP) - The whereabouts of former Thai prime minister Yingluck Shinawatra is unknown after she was detained by the military that seized power in a coup.

"It is confirmed that she was detained by the military since she reported to the junta yesterday," a source in her Puea Thai party said on Saturday.

"We are unsure of her whereabouts because the military confiscated her mobile phones and those of her aides," said the source, who was present when Ms Yingluck answered a call to report to the army on Friday.

The Bangkok Post quoted military and other sources as saying Ms Yingluck was taken to another unspecified army installation.

Her aide Wim Rungwattanajinda told AFP on Friday that the former premier was thought to have been taken to a military camp outside the capital.

Ms Yingluck was removed from office in a controversial court ruling earlier this month that set the stage for the military takeover announced on Thursday by army chief General Prayut Chan-O-Cha. She was among 155 prominent figures from both sides of Thailand's bitter political divide who the army has said were summoned.

The list also included her successor, now-deposed caretaker premier Niwattumrong Boonsongpaisan.

Most of those summoned appear to have been Puea Thai members or prominent supporters. They were also banned from leaving the country, a step analysts said appeared aimed at averting formation of a government-in-exile.