Buckwald said he began receiving calls on an emergency phone network from climbers who "have sent word by cell phone their belief that this is it - they are coming in to get them right now."
Protesters have been in the trees since UC regents voted in December 2006 to approve a plan to build a sports training center and other facilities near Memorial Stadium.
The project calls for clearing a grove of oak trees near the football stadium, which is where protesters have been living.
The Oak Grove is located just north of the intersection Bancroft Way and Piedmont Avenue, near the International House in Berkeley.
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