Obama calls on Americans to embrace diversity on 9/11

President Barack Obama on Sunday marked the 15th anniversary of the Sept. 11 attacks by calling on Americans to embrace the nation's character as a people drawn from every corner of the world, from every religion and from every background. He said extremist groups will never be able to defeat the United States.

CLICK HERE TO WATCH various scenes from NY: moment of silence, bells tolling, dignitaries, politicians, some of the 2,977 names read.

CLICK HERE TO WATCH hundreds gathering for name-reading observance at the Flight 93 National Memorial in Shanksville, Pa.