Manchester concert explosion
Emergency responders assist an injured woman near the Manchester Arena after a deadly explosion during an Ariana Grande concert in Manchester, England, on May 22, 2017.
Injured man
An injured man is seen near the Manchester Arena after an explosion during an Ariana Grande concert on May 22, 2017. More than 20 people were killed and dozens wounded.
Inside the arena
Still image from video shows people fleeing Manchester Arena after an explosion. Singer Ariana Grande had been performing for a sold-out crowd.
Concertgoers flee
People running down stairs as they attempt to exit the Manchester Arena after the explosion on May 22, 2017. The still image was taken from video shot by concertgoer Zach Bruce, who told CBS News he escaped after hearing a "loud bang." He added, "I didn't know what was going on."
Police response
Heavily armed police at Manchester Arena in northern England after reports of an explosion at the venue during an Ariana Grande concert on May 22, 2017. Officials later confirmed more than 20 concertgoers were killed and dozens wounded. A representative said the singer was not injured.
Bomb scene
Helpers attend to injured people inside the Manchester Arena after a blast on May 22, 2017. Police said a suicide bomber blew himself up at an Ariana Grande concert as it ended Monday night.
Manchester street scene
Police and other emergency service workers are seen near the Manchester Arena after an explosion during an Ariana Grande performance. Many young people were at the concert.
Armed police
Heavily armed police respond to reports of an explosion at Manchester Arena during an Ariana Grande concert on May 22, 2017.
Police and concertgoers
Police and fans talk in the street near the Manchester Arena in Manchester, England, following a deadly explosion during an Ariana Grande concert. Greater Manchester Police confirmed there were fatalities and warned people to stay away from the area.
Manchester Arena scene
People fled the Manchester Arena after an explosion during an Ariana Grande concert in the city in northern England.
Emergency treatment
Members of the public receive treatment from emergency service staff at Victoria Railway Station near the Manchester Arena, following a deadly explosion during an Ariana Grande concert on May 22, 2017.
Outside Manchester Arena
People fled the Manchester Arena after an explosion during an Ariana Grande concert.
Emergency response
Police stand by a cordoned-off street near the Manchester Arena after an explosion during an Ariana Grande concert.
Ariana Grande
A spokesman said Ariana Grande was "OK" following an explosion at her concert in Manchester, England, on May 22, 2017.
The singer is seen here in a photo from the American Music Awards in Los Angeles on Nov. 20, 2016.
Police and concertgoers
Emergency services personnel speak to people outside Manchester Arena after a deadly explosion at the venue during an Ariana Grande concert.
Manchester concertgoers
Concert goers fled the Manchester Arena in after an explosion during an Ariana Grande concert, May 22, 2017.
Emergency services
Police and ambulances outside Manchester Arena after an explosion at the venue during an Ariana Grande concert on May 22, 2017. Officials said more than 20 people were killed and dozens wounded.
First reponders
A police van and an ambulance are seen outside the Manchester Arena after an explosion during an Ariana Grande concert at the venue in Manchester, northern England, May 22, 2017.
Forensic investigators
Forensics investigators at work outside the Manchester Arena on May 23, 2017, the morning after the deadly explosion at an Ariana Grande concert.
"Pray for Manchester"
A woman walks past an electronic advertising board displaying a U.K. flag and the words "Pray For Manchester," close to the Manchester Arena in northwest England on May 23, 2017, following a deadly terror attack at an Ariana Grande concert.
Forensic investigation
Police forensic officers leave the Manchester Arena on May 23, 2017 as they investigate the scene of the explosion, which occurred the night before as concertgoers were leaving an Ariana Grande concert.
Manchester reunion
A man embraces a woman and a teenager as he collects them from the Park Inn Hotel where they were given refuge after Monday night's explosion at the Manchester Arena.
Young victim
Saffie Roussos, 8, was identified as one of the victims of the attack at Manchester Arena. The Guardian reports she was attending the concert with her mother and sister, who were both wounded.
"Saffie was simply a beautiful little girl in every aspect of the word. She was loved by everyone and her warmth and kindness will be remembered fondly," said Chris Upton, the head teacher at her primary school.
Bomb victim posed with Ariana Grande
18-year-old Georgina Callander was the first identified victim from the Manchester Arena bombing. These photos of her with singer Ariana Grande were taken in 2015.
Flowers for the victims
A woman lays flowers at a memorial for the victims of the Manchester Arena attack in central Manchester, England, May 23, 2017.
Police at memorial
Police officers relocate floral tributes in St Ann's Square in Manchester, northwest England, on May 23, 2017, following a deadly terror attack at the concert at the Manchester Arena the night before.
Prime Minister visits
Britain's Prime Minister Theresa May meets Chief Constable of Greater Manchester Police Ian Hopkins on May 23, 2017 in Manchester, England. May held an emergency meeting with government officials the morning following a suicide attack at Manchester Arena that killed more than 20 concertgoers.
#TurnToLove
People hold up signs which say "#TurnToLove #ForManchester" during a vigil for the victims of the Manchester Arena terror attack in Trafalgar Square, London, on May 23, 2017.
Moment of silence
Queen Elizabeth II and her husband Prince Philip, Duke of Edinburgh observe a minute of silence at Buckingham Palace on May 23, 2017, in honor of the victims of the attack at Manchester Arena the night before.
Manchester memorial
A man and a child light a candle alongside floral tributes in Albert Square in Manchester, England, on May 23, 2017, in memory of those killed and injured in the May 22 terror attack at the Ariana Grande concert at the Manchester Arena.
"We are strong"
A man writes a message on the pavement in central Manchester, England, May 23, 2017.
Manchester memorial
Members of the public attend a vigil to honor at Albert Square in Manchester, England, on May 23, 2017, to honor the victims of the terror attack at the Ariana Grande concert at Manchester Arena the night before.
Sidewalk memorial
Flowers and messages for the victims of the Manchester Arena attack are seen in central Manchester, England, May 23, 2017.
European memorial
Flowers for victims of the deadly suicide bombing at Manchester Arena are seen in front of the British embassy in Berlin, Germany, May 23, 2017.