HAMPSHIRE residents are being warned to be vigilant after a suicide bomb attack left 22 people dead in Manchester.

A lone bomber detonated a homemade device packed with nuts and bolts in the foyer of the Manchester Arena as thousands of young people were leaving a concert by US pop star Ariana Grande on Monday night.

The attacker has not been officially named but investigators believe they know his identity.

Olivia Pinkney, chief constable of Hampshire Constabulary, said: "Our thoughts are with all those affected by the events in Manchester last night; with the families, friends and loved ones of all those killed and injured.

“We have reviewed, and will continue to review, our security plans and capability, including around all pre-planned events taking place in Hampshire and the Isle of Wight in the coming weeks. 

"It is normal procedure for us to work with event organisers in the run up to all large scale events to ensure they can run these safely and securely.

“We will also continue to link in with our colleagues at Greater Manchester Police, the National Police Chiefs Council and the South East Counter Terrorism Unit. 

“I urge the community to remain alert but not alarmed – we, together with our partners, are doing everything we can to help protect the public, the security of our communities, public places and businesses. 

"Specialist teams, well-rehearsed at dealing with major incidents, continue to provide a strong visible presence across the UK.

“We advise the public to remain vigilant and to report any suspicious behaviour or activity on 0800 789 321 or in an emergency the public should always call 999.

"For further information about reporting suspicious behaviour visit https://act.campaign.gov.uk/.

"If you get caught up in the rare event of a weapons attack we urge you to follow the 'Run, Hide, Tell' advice.”

Greater Manchester Police have issued an appeal for dash-cam footage from anyone who was in Manchester city centre between 8pm and 11pm on Monday.

The force said the footage should be uploaded to https://ukpoliceimageappeal.co.uk/.