Violence flares after Egypt election results

CAIRO — A mob set fire late Mon­day to the cam­paign head­quar­ters of one of the two Egypt­ian pres­i­den­tial politi­cians fac­ing each other in a runoff that will decide a new leader after last year’s pop­u­lar upris­ing, the first sign of unrest after the vot­ing yielded divi­sive candidates.