Last summer, researchers dug up the bone shards near Yekaterinburg and enlisted Russian and U.S. laboratories to conduct DNA tests.
"The main genetic laboratory in the United States has concluded its work with a full confirmation of our own laboratories' work," Rossel told reporters.
"This has confirmed that indeed it is the children."
It was unclear which laboratory Rossel was referring to, but a genetic research team working at the University of Massachusetts Medical School has been involved in the process.
The university did not immediately comment on the report Wednesday.
The press service for the Russian Orthodox Church said no one could comment on the discovery.
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