ISIS supporters have been celebrating the bomb attack in Manchester - but there has not yet been any official claim of responsbility.
At least one blast killed 19 people and injured around 50 others as they were leaving the Ariana Grande concert at Manchester Arena last night.Police are treating the explosion as an act of terrorism.
Twitter accounts linked to Islamic State have used hashtags referring to the blast to post celebratory messages, with some users encouraging similar attacks elsewhere,Reuters reports.
"It seems that bombs of the British airforce over children of Mosul and Raqqa has just came back to Manchester," one user named Abdul Haqq said on Twitter.Supporters posted messages encouraging each other to carry out "lone wolf" attacks in the West and shared Islamic State videos threatening the United States and Europe.
