Police in Rome say seven men were injured. Five were British, one Californian and one Bangladeshi.
A group of about 40 or 50 people in motorcycle helmets or with their faces covered were armed and attacked the group of English football fans drinking in Campo de Fiori square. The more seriously injured seems to be the Briton born in 1987. The American was born in 1982.
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The scan of the object will begin on Wednesday, with astronomers using four different radio frequency bands. It will last around 10 hours.