Barbara Stocking, Oxfam's chief executive, said a "global new deal" was needed to reverse decades of increasing inequality.
We can no longer pretend that the creation of wealth for a few will inevitably benefit the many - too often the reverse is true.
Concentration of resources in the hands of the top 1% depresses economic activity and makes life harder for everyone else - particularly those at the bottom of the economic ladder.
In a world where even basic resources such as land and water are increasingly scarce, we cannot afford to concentrate assets in the hands of a few and leave the many to struggle over what's left.
More top news
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.