Norwegian Nobel Committe will announce this year's Nobel Prize on Friday

The Nobel Peace Prize is always widely anticipated and sometimes controversial.

The Norwegian Nobel Committee, which will announce this year's prize on Friday, has received nominations for 216 individuals and 115 organizations.

But only a few dozens of them are known — the committee keeps the list of nominations secret for 50 years, although some candidates are revealed by their nominators.

Among those put forward this year are the Syrian civilian aid group White Helmets, Russia's Novaya Gazeta newspaper, Edward Snowden and the UN High Commissioner for Refugees.

Last year's winner was the International Campaign to Abolish Nuclear Weapons.

The 2018 prize is worth 9 million Swedish kronor ($1.01 million). Past winners who came under criticism include former U.S. President Barack Obama, who won in 2009 after less than a year in office.

(With inputs from agencies.)