Law enforcement sources tell TMZ, Diddy allegedly attacked the coach with a kettlebell weight. He was arrested for assault with a deadly weapon ... a felony.
Our UCLA sources tell us Diddy confronted Strength and Conditioning Coach Sal Alosi while Alosi was on the phone. We're told Diddy was told to "hang on" but he wasn't having it and picked up a kettlebell and swung it, narrowly missing Alosi. One source said if Diddy had connected it could have killed Alosi.
Kettleballs:
We're also told the entire altercation is on video.
And get this ... we're told Diddy is referred to by the UCLA staff as a "helicopter dad" for hovering over practices.
By the way ... Alosi is infamous in his own right. He was a NY Jets coach who was suspended by the NFL in 2010 after tripping a Miami Dolphins player who was covering a punt.