Police in Brazil's biggest city say a construction worker has been killed in an accident on a monorail meant to expand Sao Paulo's transport network.
The worker was hit by a large concrete support beam that fell while being erected.
An investigation into the cause of the accident is underway.
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Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.
The violence began after a counter-protester allegedly doused a female rally organiser with pepper spray.
As temperatures climb through the day, the warmest spots are likely to be across western parts of Northern Ireland and western Scotland.