Inside look at the Christian and Jewish groups trying to build a temple at Al-Aqsa Compound

One of the holiest sites in the world in Islam, Judaism, and Christianity, Al-Aqsa Mosque, is once again at the center of religious tensions. Muslims are now warning that it's under attack, as some Evangelical Christian and Jewish groups try to push them out. NBC News' Richard Engel reports from the Al-Aqsa Mosque compound in Jerusalem.