Israel is investigating the Palestinian governor of Jerusalem over its broad-sweeping definition of "terrorism", his lawyer said on Monday.
Adnan Ghaith has been arrested by Israeli security forces more than 10 times in the past two years, including once for ensuring Palestinians had access to essential services to fight the coronavirus pandemic.
Typically, Mr Ghaith has been detained over the minor offence of engaging in "illegal" political activities in the disputed city.
He has generally been released within a day or two.
But Mr Ghaith's lawyer, Mohammed Mahmoud, said that in addition to political offences, the governor was being investigated over "planning an act of terrorism," and not expected to be released soon.
Under Israeli law, the investigation does not necessarily mean he is suspected of plotting an act of violence.
It was the first time Mr Ghaith was the subject of a terrorism investigation and Israel's powerful domestic security agency, the Shin Bet, was involved in the case, Mr Mahmoud said.
Shin Bet did not immediately respond to a query about the investigation.
Police spokesman Micky Rosenfeld said Mr Ghaith was arrested at his East Jerusalem home on Sunday.
"He is being questioned by security forces," Mr Rosenfeld said.
Israel occupied East Jerusalem in the 1967 Arab-Israeli War and later annexed it in a move never recognised by the international community.
It considers the entire city its capital, while the Palestinians see the eastern sector as capital of their future state.
Israel bans all Palestinian Authority activities in the city.
As a result, the PA has a Minister for Jerusalem Affairs and a Jerusalem Governor in Al Ram, on the other side of the Israeli wall that separates the city and the occupied West Bank.