Updated

Prosecutors in Britain say a 17-year-old boy accused of planning a series of gun and bomb attacks on his former school was inspired by mass shooting sprees, including the one at Colorado's Columbine High School in 1999.

The teenager, who could not be named for legal reasons, is accused of planning terror attacks on the school and other targets in Leicestershire in central England. He was arrested after being found with a machete, and police found weapons, including partially-assembled gasoline bombs, at his home.

Prosecutor Max Hill said Thursday the teenager kept a book called "Spree Killers" and had noted down the number of people killed at Columbine and by Anders Behring Brevik in Norway in 2011 .

The defendant denies terrorism offenses but has admitted possessing bomb parts.