The Israeli military says a militant Hamas leader whose son collaborated with Israel has been arrested in the West Bank.

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.