CRM 2011 BulkDeleteIndependent_[Guid] tables

Hi guys,

I have started to perform a "spring cleaning" of our CRM 2011 database. Among the log tables I have found some tables which names start with BulkDeleteIndependent_[Guid].

I thing that these tables are created by the system in order to use them and then drop them. Some how ours are still there, may I drop them? 

Thank you,