pursue a nuclear deal with iran. iranian president rouhani said they are prepared to engage in nuclear talks and nuclear weapons have no place in his country s security. christiane amanpour will join us live with her exclusive interview. the nation of kenya beginning three days of mourning for the 61 civilians killed by terrorists at a nairobi mall. government officials say five members of the al shabaab militant group were also killed during that siege. 11 others are in custody. kenya s president says three floors of the mall collapsed, leaving an unknown number of bodies trapped below the rubble. a shooting at a chicago park was retaliation for an earlier shooting. brian champ allegedly fired into the crowd after he was grazed in a separate incident. he s one of four people facing attempted murder and other charges. 13 people were injured, including a 3-year-old boy.