US President Barack Obama’s presence in Oslo was not lost on environmentalists who urged him to ‘earn’ his Nobel Peace Prize by getting to grips with global warming.
Plans for a new American military base in Italy also sparked protests in the city and campaigners for the rights of children made their voices heard.
Across the Atlantic in New York, the organiser of an anti-war demonstration claimed awarding the Nobel Peace Prize to a wartime president diminished the honour.
“I think it does diminish the prize and it is a great disappointment and I think it undermines all of the work for peace and justice that really needs to continue happening,” said Frida Berrigan.
Obama’s acceptance of the peace award, just days after opting to escalate US troop levels in Afghanistan, particularly angered protesters.