Hellsing

Synopsis

Integra learns that Hellsing commandos in the Tower of London were being attacked by assassins wearing CRW uniforms of the SAS's 22nd Regiment. Despite the odds, some of the surviving Hellsing commandos, Alucard and Seras team up to fight back against them, revealed to have been turned into a different kind of FREAK vampires. The entire Hellsing Organization was declared to be armed terrorists with the British Army on the scene arriving to quell the Hellsing soldiers and end the FREAKs in the Tower of London.

(Source: Wikipedia)