Screenshot of the blockbuster "Kingsman: The Scret Service" [Photo: agencies]

A sequel to the surprise blockbuster "Kingsman: The Secret Service" is in the works at Fox.

The blockbuster film directed by Matthew Vaughn and starring Colin Firth just topped 400 million US dollars at the global box office.

Samuel Jackson, Michael Caine and Taron Egerton co-starred in "Kingsma," which had an 80 million dollar production budget.

Vaughn also co-wrote with screenplay with Jane Goldman and produced the film, which was based on the comic book "The Secret Service" written by Mark Millar and Dave Gibbons.