Israeli troops detained about 90 volunteers with Rabbis for Human Rights in the West Bank on Wednesday. Brad Lander, a New York congressional nominee, was among them.
Two hours into the harvest, troops declared the grove a closed military zone.
Activists say they agreed to leave but were detained anyway.
Former Israeli deputy attorney general Yehoshua Schoffman was also detained.
One detainee said no one was harmed.
Why it matters: Lander faces voters Nov. 3 after a primary shaped by views on Israel. He has called the Gaza war a genocide.
76 Palestinians in the West Bank were killed this year through July, a UN report said.
900+ Palestinians were injured in settler attacks this year, the same report said.
Left coverage, 13 sources: The left sees the detention of a congressional candidate against a backdrop of rising settler violence against Palestinians.