I just heard Landers talk about it when he was released from an IDF facility in the West Bank. He called Ryan Grim on breaking points and they had him talk about what happened.
He said about 60 people were part of the group. The group, Protect the Harvest, has nearly 30 American members, with many of the members being American Rabbis part of a group called Rabbis for Peace. They are all still detained, or were as of his call, including the other international volunteers and the Palestinians whose olive farm they were helping to harvest. The Palestinians were split up from the group and brought somewhere else, including the owner of the farm.
The farm was right next to a modern settlement, he said it only took about an hour of harvesting before a security truck from the settlement spotted them and the IDF picked them up next.
This was the second harvest they had been engaged in either that day or this week.
https://youtu.be/kwv-pnxquSI?t=736&is=
Here's a link to the call, it starts at around 12:16.