Milton Keynes
"Abhorrent" group rips down signs, throws traffic cones and steals medical supplies.
"It was a devastating day made even worse," the son said, as council apologises for upsetting family.
811 are now known to have died.
Around 150 Britons will be flown back from the Chinese city and quarantined at a facility in Milton Keynes.
Murder investigation launched after a man in his early 20s dies.
Dom Ansah and Ben Gillham-Rice, both 17, were both fatally stabbed by masked attackers at the party last month.
Dom Ansah and Ben Gillham-Rice were both stabbed to death last month.
Two men have already been charged following the double murder.
A 27-year-old man has been arrested on suspicion of conspiracy to murder, police said.
Earl Bevans, 22, was charged with two counts of murder and two counts of attempted murder on Friday.