A 34-year-old man and a young boy were taken to hospital with serious injuries.
The pop star will return to the city where 22 people died in the arena bomb attack.
Marley's owner said he was "extremely angry" about the alleged incident at Pets at Home.
After Grace Millane's death women talk of lone travel
How "Babes in the Wood" killer was caught after 30 years of lies
Showcasing the best images sent to us from around England
A new BBC podcast aims to dispel the no-humour myth
Should the homeless have to live in 'micro-homes'?
What questions do you have about the festive season?
Watch live coverage from the Track Cycling World Cup from Lee Valley VeloPark in London.
Have you been getting these songs wrong?
What happens to your body in extreme heat?