There has been a terrorist attack.
Update, May 23, 2017:
Police on Tuesday identified the man who blew himself up the previous night at an Ariana Grande concert in Manchester, England, as 22-year-old Salman Abedi. CBS News confirmed Abedi was known to British authorities prior to the attack.
In a generic statement posted online, the Islamic State of Iraq and Syria claimed responsibility for Abedi's suicide bomb attack, which left 22 people dead, including children, at one of the entrances to the Manchester Arena. Source.
On May 22, 1176, the Hashshashin (Assassins) attempted to murder Saladin near Aleppo.
On May 22, 1962, Continental Airlines Flight 11 crashed after bombs exploded on board.
On May 22, 2017, Ariana Grande's concert at the Manchester Arena, in Manchester, UK, was emptying and at least one bomb went off. Police report that it was caused by a suicide bomber. Waves of photos pervaded social media of audience members fleeing the venue bloody and with torn clothing. The crowd was predominantly young kids, teenagers and their parents.
The Greater Manchester Police Department revised their earlier report of 19, to 22 people were killed and 59 people were injured by an explosion as they were exiting the venue. The GM Police are treating the incident as a terrorist attack.
Police believe the attack was perpetrated by a suicide bomber wearing a backpack, NBC News reports. The incident would mark the worst terrorist attack on U.K. soil since the July 2005 London bombings. Wide spread confirmation of the suicide bomber details held up as the bomber's body was analyzed more overnight.
Witnesses believe the attacker used a nail bomb, and the injuries are consistent with the aftermath of that device, the New York Times reports. A nail bomb was also detonated earlier in the day at a Bangkok military hospital, an incident that result in 24 injuries.
A "bang" was heard at approximately 10:35 p.m. London time, around the same time Grande played her last song and people began exiting the venue. Universal Music representative Joseph Carrozza told Rolling Stone the pop star is "okay."