The former top lawyer in the Israeli military has been arrested, as a political showdown deepens over the leaking of a video that allegedly shows severe abuse of a Palestinian detainee by Israeli soldiers.

Maj Gen Yifat Tomer-Yerushalmi resigned as the Military Advocate General of the Israel Defense Forces (IDF) last week, saying that she took full responsibility for the leak.

On Sunday, the story took a darker turn when she was reported as missing, with police mounting an hours-long search for her on a beach north of Tel Aviv.

She was subsequently found alive and well, police said, but was then taken into custody.

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In her resignation letter, she said she took full responsibility for any material that was released to the media from the unit.

"I approved the release of material to the media in an attempt to counter false propaganda against the army's law enforcement authorities," she said.

That is a reference to efforts by some right-wing political figures in Israel to claim that the allegations of severe abuse of the Palestinian detainee had been fabricated.

She added: "It is our duty to investigate whenever there is reasonable suspicion of acts of violence against a detainee."