Our correspondent said the meeting was taking place as developments, including Israeli air strikes on targets in Syria and concerns about the possible use of chemical weapons, risk bringing the conflict into an even more dangerous phase.
It is understood there were two meetings on Monday between Culture Secretary Maria Miller, Labour deputy leader Harriet Harman and Lib Dem peer Jim Wallace to pave the way for the leaders' meeting, our correspondent added.
The audiotape's leak was the main subject of a meeting hastily called Tuesday by trial Judge John Cleland and attended by prosecutors, defense attorneys and even the judge who has overseen the grand jury that's investigated the Sandusky case, a source with knowledge of the meeting told CNN National Correspondent Susan Candiotti.