The 34-second trailer for the latest series of the high-octane US drama 24 shows Jack Bauer attempting to avert the assassination of the US president while on a visit to London.

The trailer stars Kiefer Sutherland as Bauer, along with Mary Lynn Rajskub as Chloe O'Brian, plus new arrivals Tate Donovan and Benjamin Bratt. William Devane will also reprise his role as James Heller - formerly secretary of state, and now president. Stephen Fry plays the British prime minister.

The revival, set four years after the last series, premieres in May.