Road blocks and marches hit Brazilian cities on Thursday as disparate groups criticised spending on the upcoming World Cup soccer tournament and sought to revive a call for better public services that swept the country last June.
Brazil is threatening to halt construction on the already delayed World Cup stadium over concerns for workers' safety.
Prosecutors claim to have found irregularities at the Itaquerao Stadium, where nearly 20,000 temporary seats are being installed ready for the opening match in four weeks.
Constructors were reportedly advised about safety problems a few weeks ago, but nothing has been done.
But the company in charge of the temporary seats dismissed claims work would be stopped and said the complaints were about "minor issues."
A police officer has suffered potentially life threatening injuries after being assaulted in Doncaster.
Eight cases of fraud and four possible thefts are being investigated, Scotland Yard said.
The US president is set to call on leaders to rally together in the face of threats from North Korea and Iran at the UN General Assembly.