Russia fears hypersonic missile leaks

Russia's Federal Security Service (FSB) has raided a space research facility after a suspected leak of hypersonic missile secrets to Western spies.

The state space agency Roskosmos said its security staff were co-operating with FSB officers on a criminal case.

Russia's Kommersant daily said about 10 staff at a Roskosmos facility called TsNIIMash are under suspicion. A director's office was searched, according to BBC News.

Hypersonic missiles fly at more than five times the speed of sound (Mach 5).

On Thursday Russia released video of two new hypersonic missile systems - called Kinzhal and Avangard. Both can deliver nuclear warheads.

The suspects in the secrets case could be charged with high treason, Kommersant reports.