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MANCHESTER, ENGLAND - MAY 23: Members of the public are escorted from the Manchester Arena on May 23, 2017 in Manchester, England.  An explosion occurred at Manchester Arena as concert goers were leaving the venue after Ariana Grande had performed.  Greater Manchester Police have confirmed 19 fatalities and at least 50 injured. (Photo by Dave Thompson/Getty Images)
MANCHESTER, ENGLAND - MAY 23: Members of the public are escorted from the Manchester Arena on May 23, 2017 in Manchester, England.  An explosion occurred at Manchester Arena as concert goers were leaving the venue after Ariana Grande had performed.  Greater Manchester Police have confirmed 19 fatalities and at least 50 injured. (Photo by Dave Thompson/Getty Images)

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Manchester terror bomb might provide vital clues

Could he make this bomb alone? Our terror experts talk about the keys to finding the attacker's possible ties to a larger terror cell.

Manchester terror bomb might provide vital clues

Could he make this bomb alone? Our terror experts talk about the keys to finding the attacker's possible ties to a larger terror cell.