Law enforcement sources tell us ... cops raided Charlie Sheen's house after receiving a call earlier today that Charlie threatened to harm himself with a firearm.
Under the restraining order obtained by Brooke Mueller, Charlie is prohibited from possessing weapons.
Cops are inside the house right now, searching for firearms and ammunition.
And law enforcement tell us cops are not trying to place Charlie on a 5150 psychiatric hold.
Charlie, his lawyers, and several friends are sitting at a table in the backyard eating hamburgers. KTLA shot video of the surreal scene from their helicopter.
We are told the LAPD has been conducting several investigations involving Charlie, including the possible violation of the TRO.
UPDATE 10:18 PM PT -- Sheen just tweeted: "#fastball; the LAPD were AWESOME. Absolute pros! they can protect and serve this Warlock anytime!!! c"