Photo: World Leaders, With Arms Linked March Through Paris

World leaders march during a rally in Paris, France on Jan. 11, 2015. (AP Photo/Philippe Wojazer, Pool)

More than 40 world leaders, their arms linked, marched through Paris Sunday to rally for unity and freedom of expression and to honor 17 victims of three days of terrorist attacks.

The leaders were heading a demonstration of at least tens of thousands of people who converged on the capital after three gunmen attacked a newspaper office, kosher supermarket and police. Deafening applause rang out over the square as the leaders walked past, amid tight security and an atmosphere of togetherness amid adversity.

Families of the victims, many weeping and embracing, were also at the front of the march along with the world leaders, including French President Francois Hollande, top representatives of Russia and Ukraine, as well as Israeli Prime Minister Benjamin Netanyahu and Palestinian President Mahmoud Abbas.