Sunday marked the 101 anniversary of what Armenians and many other nations say was genocide of ethnic Armenians. Turkey refuses to recognize the murder and starvation of some 1.5 million as an organized effort, saying Turks were also victims.
"Today, we are all Armenian. We have one cause and that cause is justice, " US Representative Adam Schiff said in an address to the crowed, as quoted by Los Angeles Times.
People at the gathering waved Armenian flags and held up signs demanding justice and reparations from the Turkish government, according to the outlet.
Earlier in the day, Turkish President Recep Tayyip Erdogan sent a message to General Vicar of the Armenian Patriarch of Constantinople Archbishop Aram Ateshian, expressing his condolences to relatives of the victims of the 1915 massacre.