Mayor Burkhard Jung said a suspect was detained and the motive was unclear.

The operator of the MV Hondius ship says a Dutch husband and wife, as well as a German national, have died but the cause has not yet been established.

The ex-New York mayor 'remains in critical but stable condition', according to his spokesman.

The attack comes as the Kremlin prepares to hold a scaled-back military parade on Saturday.

The 44-year-old will avoid jail time after her arrest in California earlier this year.

They gathered information using a "forest of antennas" installed on top of diplomatic buildings, the foreign minister says.