9:21 AM PT -- TMZ has obtained the police report describing what allegedly happened in the lead-up to Bam Margera fleeing into the woods -- and it's a shocking account.
According to cops -- who say they spoke to the alleged victims, who happen to be Bam's family members in this case -- the former 'Jackass' star started banging on his brother Jesse's bedroom door around 8 AM on Sunday ... and left an ominous note behind.
Jesse told police the signed letter from Bam read, "If you even f***ing think of calling the police on me I will officially f*** you up." Jesse goes on to say he then went downstairs to find Bam peeing into the kitchen sink, at which point ... a fight allegedly broke out.
In the docs, Jesse claims Bam wailed on him and struck him multiple times in the head -- and cops make a note of this in their report, noting visible injuries they say they observed.
After the brawl, Jesse goes on to allege that Bam said, "I'll kill you. I'll put a bullet in your head." Jesse also told police that Bam allegedly said he'd also kill everyone in the house ... the occupants of which, at the time, included his dad Phil and two other women. Jesse told police that Bam fled into the woods behind their house after this ... and cops say they came up short when they went looking for him.
Bam Margera is a wanted man in Pennsylvania on a slew of criminal charges -- this after cops say he got into an altercation ... and made a getaway into the woods.
The Pennsylvania State Police tells TMZ ... State Troopers responded to a reported disturbance Sunday morning around 11 AM ET near Pocopson Township -- which resulted in an alleged victim accusing Bam of being involved in some sort of physical confrontation.
The only problem ... by the time cops showed up, Bam had fled the scene of the incident into a nearby wooded area, and as of now hasn't been found.
Now, a warrant has been issued for his arrest ... and the PA State Police are actively searching for him -- asking the public for any help on info regarding his whereabouts. The charges he's facing sound pretty serious ... although, we're told they're all misdemeanors.
While we still don't know what exactly happened here -- or who the alleged victim is -- we know BM's facing 4 counts of terroristic threats with intent to terrorize another, one count of simple assault and a final count of harassment while subjecting another to physical contact.
As you know ... Bam's been going through a lot of issues in his personal life of late -- most of which seem to stem from his addiction and substance abuse issues ... not to mention his partying lifestyle.
We covered it all in the latest episode of The TMZ Podcast, available on all podcast platforms!