http://www.haaretz.com/news/diplomacy-defense/1.657783

U.S. blocks NPT conference statement over Israeli objections

The statement was expected to task the UN secretary general with convening an international conference on making the Middle East a nuclear weapons-free zone by March 2016.

By Barak Ravid and Reuters | May 23, 2015 

The United States blocked the issuing of a concluding statement for the Nuclear Nonproliferation Treaty Review Conference that closed Friday night in New York, following objections voiced by Israel.
The balanced final draft of the concluding statement was expected to task the UN secretary general with convening an international conference on making the Middle East a nuclear weapons-free zone by March 2016. Israel objected to the deadline.
According to the U.S. the statement wasn't issued because the members were unable to overcome disagreements on an atomic weapons ban for the Middle East. The super-power blamed on Egypt. http://www.haaretz.com/news/diplomacy-defense/1.657783