Chinese President Xi Jinping on Sunday called for the world to reject protectionism even as American and European pressure mounts on Beijing to lower market barriers.
Kindergartens, elementary schools and students in China have been attacked several times before by suspects authorities have said were mentally ill.
BRICS comprises five major developing countries - Brazil, Russia, India, China and South Africa.
US Ambassador to the United Nations Nikki Haley said the US is "reviewing its participation" in the Human Rights Council over what said is the group's "chronic anti-Israel bias".
Speaking alongside Chinese Premier Li Keqiang, the EU's Donald Tusk said efforts to reduce pollution and combat rising sea levels would now continue without the United States.
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