NEW YORK - Mayor Michael Bloomberg and the Port Authority Thursday announced that the New York City and the Port Authority of New York and New Jersey have agreed on a plan to jointly police and secure the World Trade Center site.

The agreement marks a milestone in the rebuilding effort, under which the NYPD, working with the Port Authority, will develop and implement a comprehensive security plan for the site and the surrounding area, official said.

To ensure that security operations at the site are seamless, NYPD will have access to all Port Authority facilities within the area, and the NYPD and the Port Authority will develop a plan that addresses both the public streets and transportation facilities, as well as the private office towers and other public facilities at the site, including the World Trade Center Memorial.