Ja Rule has slammed 50 Cent in his new book and claims the rapper was out to ''destroy'' him.

The star lashes out at the 'In Da Club' hitmaker in his memoir 'Unruly: The Highs and Lows of Being a Man' after a long-running feud with the star, real name Curtis Jackson, and claimed he was falsely accused by the 'Candy Shop' singer after he was hospitalised with nine gunshot wounds in 2000.

He writes: ''When they [the police] asked him who he thought had shot him, it would make sense that 50 would have said, 'Ja Rule, Irv Gotti and Murder Inc.'''

50 later insisted he never cooperated with officers, even when they tried to make a case against Ja Rule's colleagues Irv 'Gotti' Lorenzo and Irv's brother Chris, who were acquitted of laundering drug money through their label, Murder Inc., in 2005.

Ja Rule, 38, claims the case couldn't have been made without the rapper speaking to the police.

According to the New York Daily News newspaper's Confidenti@l column, he wrote: ''He secretly led them through his recordings for the answers they were looking for.''

Ja Rule also claimed the pair - who buried the hatchet in 2011 - previously got into a fight in 2000 at a peace summit in Atlanta, Georgia and 50 ''was a crazed man on a mission to destroy me.''

He wrote: ''50 tried to swing on me, but I dipped, then I hit him with the baby Louisville Slugger [a baseball bat].

''Bam! I dropped the bat. I pulled the shirt over his head. I started catching him left, right, uppercut.''

50's crew reportedly ran away and Ja Rule also claims he led the charge in the Hit Factory recording studio attack in Midtown later the same year when 50 was stabbed.

Ja Rule, real name Jeffrey Atkins, admits he armed himself with a crutch taken from an injured crew member and marched into the recording studio to take it out on 50.

He said: ''I hit him with the crutch. We proceeded to whip his ass. I was putting in my work. 50 was crunched in the corner. I slammed the big Tannoy speaker down on him.''

His book 'Unruly: The Highs and Lows of Being a Man' is out next Tuesday (01.07.14).