WATCH: IDF detains 90 West Bank olive harvest volunteers, including US congressional nominee Lander

Rabbis for Human Rights said that its volunteers were working near Bethlehem to accompany Palestinian farmers to groves as part of the olive harvest.

Some 80 volunteers with Rabbis for Human Rights were detained by the IDF in the West Bank on Wednesday, including congressional nominee Brad Lander (D-NY) and former deputy attorney-general Yehoshua Schoffman, sources told The Jerusalem Post.

Rabbis for Human Rights said the volunteers were working near Bethlehem to accompany Palestinian farmers to groves during the olive harvest.

The IDF arrived two hours after the volunteers, and declared the field a closed military zone. Volunteers were then transported to a police station for processing.

The organization added that the Palestinian farmers had been unable to access the olive groves for three years.

Rabbis for Human Rights activists detained in West Bank

Leadership from Rabbis for Human Rights said that their work in the West Bank was peaceful, but noted that activists were still detained by the military.

"We came to accompany farmers to land they had been unable to access for three years, and after two hours of peaceful olive harvesting, large numbers of troops arrived and closed off the area. No one could have known about this order in advance. Instead of protecting people working their land, the army is keeping them away from it and detaining those who came to accompany them for identification,” acting executive director of Rabbis for Human Rights Anton Goodman said.

On Tuesday, Lander, the former New York City comptroller, posted a video announcing that he was volunteering in the West Bank with the organization.

"Our goals for the trip are to help protect the olive harvest — and to shed a light on the reality of the occupation. To ensure that international solidarity goes beyond the harvest, to become a sustained commitment to protecting Palestinian communities from settler violence, forced displacement, and the ongoing threats to their right to remain on their land," he wrote.

"Thankfully, our corner of today's harvest was peaceful and successful. But violence, unfortunately, is never far away."