Yusuf Halacoglu, head of the state-funded Turkish Historical Society, told Hurriyet the archive in Boston includes important documents on the events of 1915.

Halacoglu said he had been told the archives cannot be opened because they need proper cataloging.

"This would directly open a debate over the genocide claims," he said. "Armenians are aware of this and therefore they are doing their best not to sit at the table."

Armenians and most non-Turkish scholars of the period say 1.5 million Armenians were killed by the Ottoman Empire in 1915 and generally label the deaths genocide -- a term the Turkish government disputes. The official Turkish version is that about 300,000 Armenians and 300,000 Turks were killed in an Armenian bid for independence.

About 50,000 Armenians remain in Turkey.