The remains of the other Romanovs were exhumed in 1991Russian scientists have said they may have identified the missing remains of two of Tsar Nicholas II's children, who were executed after the revolution.
Experts said it was "highly probable" the remains found near Yekaterinburg in July were Alexei, the heir to the throne, and Maria, his elder sister.
After they were shot, the bodies of the tsar and the remainder of his family were burned, doused with acid and thrown into a pit.
Final identification of the rest of their family took years, and they were ceremonially buried at the St Peter and Paul Cathedral in St Petersburg in 1998.
Even since then, some members of the Russian Orthodox Church have continued to question the scientists' conclusions, our correspondent says.