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Emergency services work at Manchester Arena after the explosion at the venue during an Ariana Grande concert in Manchester. Police advised the public to avoid the area around the venue. A representative said the singer was not injured. Photo: AP

A person is wheeled away on a stretcher at Victoria Railway Station close to the Manchester Arena. Emergency vehicles were on the scene helping the injured and bomb disposal units were later seen outside the venue. Photo: Getty Images

Members of the public are escorted from the Manchester Arena to a safer place. A number of Manchester taxi services said they were offering free rides to people trapped by the incident. Photo: Getty Images

Members of the public receive treatment from emergency service staff at Victoria Railway Station close to the venue. Photo: Getty Images

Armed police stand next to an ambulance at the Manchester Arena. Greater Manchester Police say they are working with national police and intelligence agencies in what is being treated as a terrorist incident. Photo: AP

Police block roads near to the Manchester Arena, seen at the right, in central Manchester, on Tuesday. City officials said the true spirit of Manchester was surfacing in the hours after the incident. Photo: AP

Many Manchester residents responded early on Tuesday with offers of shelter and details on locations where displaced concert-goers had been taken in. Photo: AP