Moscow  - Ninety years after the murder of the last Russian tsar's family by the Bolsheviks, science has identified the mortal remains of two of Tsar Nikolaus II's children, Interfax news agency reported Wednesday.

A US genetics lab has established that the bones are those of Prince Alexei Nikolayevich - the tsar's heir - and Grand Duchess Maria Nikolayevna, said Eduard Rossel, governor of the Sverdlovsk region where the royal family was shot dead in July 1918.

"So we have found the whole family," Rossel said.

The bones of Nikolaus II, his wife Alexandra and three of their daughters were discovered in 1991 and laid to rest in a St Petersburg cathedral in 1998. However, the remains of Alexei and Maria were not found that time.

The grave containing their bones was discovered in a forest near the city of Yekaterinburg in the Urals last summer. (dpa)