The United Kingdom appears to have experienced another Islamic terrorists attack similar in type and scope to some recent attacks elsewhere in Europe.
The police are claiming that there was one suicide bomber. The Manchester Arena terror attack currently has a casualty count of 22 dead. The dead include children.
Prime Minister May has described it as a suicide bombing. Campaigning has been suspended..
Here are some eyewitness accounts.
Abby Mullen from Airdire, North Lanakshire who was at the event said: 'As we were leaving a bomb or explosion went off centimetres in front of me. People's skin and faeces where everywhere including in my hair and on my bag.
'I'm still finding bits of God knows what in my hair. You never ever expect these things to happen to you but this proves it can happen to anybody.
That sound, the blood and those who were running around clueless with body parts and bits of skin missing will not be leaving my mind any time soon or the minds of those involved.'
Gary Walker, from Leeds, was with his wife in the foyer waiting to pick up his two daughters who were at the concert.
He said: 'I was waiting for the kids to come out. We heard the last song, and quite a few people were flooding out and then suddenly there was a massive flash and then a bang, smoke.
'I felt a bit of pain in my foot and my leg. My wife said, "I need to lie down". I lay her down, she'd got a stomach wound and possibly a broken leg.
'I was about three metres from the actual explosion. I am surprised I got away so lightly.'
He added his wife was taken out of the building on a table used as a 'makeshift stetcher'.
As President Trump continues his trip, we have yet another reminder that Islamic terrorism never ends.