Boonsongpaisan was interim prime minister when the military conducted the coup. The military, which tore up the country's constitution and declared martial law, says it so far has summoned at least 280 people, and about 200 of them -- including former Prime Minister Yingluck Shinawatra -- turned themselves in.
The military says it has released about 155 people so far, including Yingluck, who was in office when the current phase of political turmoil began in November.
Yingluck, who was removed from office by the courts earlier this month, was released from a military facility over the weekend after she followed a summons to report to military authorities on Friday.