 While some are located so as to restrict Palestinian access to Israeli areas, most of them "do not restrict the interaction between Israelis and Palestinians, but rather between Palestinians and Palestinians".Organizations like the United Nations Office for the Coordination of Humanitarian Affairs, who track such developments have reported a recent upward trend; increasing from 376 in August 2005 to 528, as of September 2006.Of these, 83 were checkpoints manned by IDF and/or Border Police and another were 445 unmanned checkpoints and obstacles.