The military would not say why Hassan Yousef of the Islamic Hamas group was taken into custody or provide any other details.
Yousef was released from an Israeli prison a month ago after serving six years.
Shortly afterward, he told an Israeli TV station that the Palestinians are planning demonstrations to support their quest for U.N. endorsement of a Palestinian state after the General Assembly convenes in late September.
Asked if the rallies could turn violent, Yousef warned of increasing frustrations.
His son, Mosab Hassan Yousef, wrote a book about his experiences spying on militants for Israel’s Shin Bet security service.
(www.signonsandiego.com / 01.09.2011)