THIS is the inside of an industrial unit which sparked a major terrorism alert.

Police pounced on the industrial estate in Birley Street, Blackburn, after a tip off in the wake of a foiled car bombing in London and the attack on Glasgow Airport last June.

But instead of making bombs, Ifzal Rafiq and Mohammed Tahir were using the fuel to help grow high-potency skunk cannabis.

Some 175 plants were found in one room, 25 "mother plants" in another and there were 62 cuttings they were trying to grow.

Rafiq, 22, and Tahir, 30, both of Keighley, pleaded guilty to producing cannabis.

Rafiq was jailed for two years and Tahir for 28 months.

Now police have released video footage of the moment they made the cannabis discovery.