VIENNA, March 3 (Reuters) - The U.N. watchdog policing Iran's nuclear deal with major powers admonished Tehran on Tuesday for failing to provide access to two undeclared locations or fully answer its questions about past activities there and at a previously known site.

Reuters first reported on Monday that the IAEA planned to issue a second report in addition to its regular quarterly update on Iran's nuclear activities, rebuking Iran for less than full cooperation in general and for failing to grant U.N. inspectors access to one or more sites of interest.

"Iran has not provided access to the agency to two locations...and not engaged in substantive discussions to clarify agency questions related to possible undeclared nuclear material and nuclear-related activities," the second International Atomic Energy Agency report said. "The director general calls on Iran to immediately cooperate fully with the agency, including by providing prompt access to the locations specified." (Reporting by Francois Murphy Editing by Mark Heinrich)