Many experts say animosities would flare again if the summits fail to produce any progress and leave the nuclear issue with few diplomatic options.
Several witnesses reported hearing a loud explosion, then seeing a large fire in the area near the train tracks.
Police have arrested a man in the fatal stabbing of two men at a Salvation Army apartment building in downtown Rochester, Minnesota.
Authorities say a missing Pennsylvania teenager and a 45-year-old man who frequently signed her out of school without her parents' permission have been located in Mexico, and the man has been arrested.
A Missouri inmate is scheduled to die by injection Tuesday evening for killing a former girlfriend's new boyfriend in 1996 in the eastern part of the state.