At least 20 people were killed and possibly hundreds of others were injured after one or more loud bangs were heard Monday night at an Ariana Grande concert at Manchester Arena in England.
Multiple U.S. officials briefed on the investigation so far said preliminary reports indicate that a single explosion took place outside the arena on the southwest side opposite the Manchester Victoria transit station, which is part of the greater arena complex.
The explosion occurred as the concert ended, catching people as they exited.
A nail bomb detonated by a suicide bomber with a backpack bomb is suspected but not confirmed.
This video shows moments after the explosion was heard as concert goers escape the arena.
This is an ongoing story and will be updated.