Three representatives of the Tunisian National Dialogue Quartet, winner of the 2015 Nobel Peace Prize, offered flowers Friday at the cenotaph dedicated to A-bomb victims at Peace Memorial Park in Hiroshima.

Visiting Japan at the invitation of the Sasakawa Peace Foundation, they visited the Hiroshima Peace Memorial Museum, which documents the U.S. atomic bombing on Aug. 6, 1945, including a corner commemorating U.S. President Barack Obama's visit to the museum in May.

The Quartet, formed in 2013, comprises four key organizations in Tunisian society representing labor, industry, human rights groups and lawyers.

It was awarded the Nobel Peace Prize in 2015 for its contribution to building a pluralistic democracy in Tunisia after the Jasmine Revolution of 2011.

In the revolution, longtime dictator Zine El Abidine Ben Ali was forced out by popular protests in January 2011, and the consequent Arab Spring movement swept the Middle East and North Africa.