FBI agents reportedly search for Uzbeks helped into US by smuggler with IS ties

Episode reported by CNN required emergency memo to senior officials and suggests agency does not know migrants' location

Federal agents are reportedly trailing a group of more than a dozen Uzbek nationals who entered the US as asylum seekers aided by a smuggler with ties to Isis.

The extraordinary episode, which multiple US officials confirmed to CNN on Tuesday, was considered so serious that it required an emergency intelligence report to senior Biden administration figures.