a former chechen policeman. iraqi fighters are advancing on isis militants in strategic town nears tikrit right now. the joint forces say they re dealing with ieds on roads and a bridge that crosses into the city. the iraqi army and other fighters have been battling for a week to retake tikrit from isis. and the unit at australia s sydney airport stopped two teenaged brothers suspected of trying to go and fight with isis. the boys parents didn t know they were even traveling. they ve been returned to their family while authorities investigate. now this story is really picking up on social media right now. a college fraternity in the u.s. state of oklahoma has now been shut down because some of its members are accused of singing a racist chant. and this chant was actually caught on video. and now that cigna alpha epsilon chapter at the university of oklahoma is paying the price. here is our george howell. reporter: the audio on this clip is disturbing. a group of young men an