In a statement Emma's family said: "She was our much-loved daughter and a baby sister. This tragic incident has left us shocked and devastated."
Read the statement in full here.
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A man, reportedly armed with a knife and a baseball bat, was detained close to the event and police cleared the area as a precaution.
A remarkably mild night
Thousands of people have gathered in the centre of Manchester for a vigil in the wake of the terror attack.