situations across our country. he goes on to say, we will continue our investigation of all students engaged in the signing of this -- singing of this chant. once their identities have been confirmed, they will be subject to appropriate disciplinary action. we have reached out for comment to that group "unheard" that posted this video. so far, we haven't heard back from them. but this just in, president david boren of the university of oklahoma expelling two students who played a leadership role in that racist video chant surfacing over the weekend. >> can i ask you this, two students -- we clearly saw one student who seemed to be taking a leadership role in that chant standing up. there were two angles, very clearly you could see his face. but there were other students on the bus other than two. is this just the tip of the iceberg or will there be more? and do we know if one of the students is the person seen in his tuxedo leading the chant?