Knives, swords, crossbows and high powered air rifles were recovered from his address.
A man has been jailed for 20-years after systematically targeting police officers, police staff, a solicitor and judge.
33-year-old Ashkan Ebrahimi, from Halifax, was sentenced yesterday at Bradford Crown Court.
He was found guilty of possessing explosives with intent to endanger life, possession on an offensive weapon, possession of a bladed article in a public place and stalking offences.
Seized computer equipment, mobile phone, camera and other items from Ebrahimi’s address unearthed the extent of the research and stalking activity that he had indulged in.
A large amount of chemicals were also recovered, along with an extensive collection of weapons including knives, swords, crossbows and high powered air rifles.
A camera revealed more than 90 videos saved that related to the creation of explosives, fuses, detonators and gunpowder.
Senior Investigating Officer, Detective Chief Inspector Warren Stevenson said; “Ebrahimi is a very dangerous individual who posed a significant and very serious threat to police officers, police staff, solicitors and the judiciary.
“He developed a deep seated and consuming hatred and loathing for people in authority, in the main police officers and set about research and planning his limitless revenge against them.
“The volume of weapons, substances and associated material recovered from his property were to enable him to commit the most serious harm to others and I strongly believe that he would have eventually executed his plans in harming a police officer on the streets of West Yorkshire.
“We are pleased with the significant sentenced passed down which acknowledges the severity of the offence, and how dangerous an individual Ebrahimi is."