While speaking with MTV Movies Blog (http://moviesblog.mtv.com), Vin Diesel reveals that two "Riddick" sequels are in the works but he's not sure how or when they will be shot.

"David Twowy right now is writing the scripts. The only question is whether we take a page from the 'Lord of the Rings' guys and try to shoot the two chapters at the same time. There are two more in mind."

Find out more about what he has to say at the link below.