Kanye West was warned to "check yourself before you wreck yourself" by a Chicago police chief who wrote an open letter to the rapper after he said in an interview that his job is a lot like that of a police chief or soldier.

In the coy letter, which has gone viral and was posted on the Independent Journal Review, Chief David Oliver pokes fun at West's choice of words.

I want to thank you for putting your life on the line for all of us every day. I know that being a rapper is tough work. I have tried to rap, and it is very difficult to keep up with the pulse of the rhyme flow…although when Ice Ice Baby comes on the radio, I can usually keep up with ol’ Vanilla. Anywho, your job is just some very dangerous work. Most people don’t consider… if you rap really fast, without a chance to inhale, you could pass out and hit your head.