4:44 PM PT -- Jess has provided an encouraging update on his brother's whereabouts, saying they've located Bam ... and that he's unharmed. This follows what he says was a scary text sent to him and other Margera family members that he claims sounded suicidal in nature.
10:26 AM PT -- Bam Margera's attorney, Peter Thompson, tells TMZ that Bam came to L.A. -- before going off the radar -- in an attempt to reunite with his son, whom we're told he hasn't seen in 2 months ... without any contact whatsoever.
We're already aware Bam has desperately wanted to touch base with his kid -- and that he's claimed his estranged wife, Nikki, isn't letting that happen -- but now ... Thompson says the separation may have driven Bam to force a meeting in person. Of course, we know Nikki doesn't want that right now -- at least not without Bam entering some kind of rehab program ... Thompson says he isn't sure if Bam is in one or planning to enter one anytime soon. However, he does say he thinks a FaceTime call, at the very least, would go a long way in putting Bam's mind at ease.
He says he was last in contact with him yesterday, and that he's going to try reaching out again to see where he might be.
Bam Margera's family seems to be fearing the worst, and his brother's putting out a Twitter APB to find him before he can harm himself.
Jess Margera tweeted early Sunday morning, "If anyone in the LA area knows of Bams current whereabouts or a hotel he might be at please call the LAPD immediately."
Jess says he's trying to get police to ping Bam's phone in order to find his location, but he's hitting some red tape -- which is why he's asking for everyone to spread the word on Twitter.
As he put it, "I don't think we have that kind of time" to wait for police.
As we reported, the former "Jackass" star had a total meltdown 3 days ago over not being able to see his son, Phoenix, amid his divorce from Nikki ... and vowed to smoke crack until he dies.
One clue to Bam's current whereabouts came in a video TMZ obtained and posted on Saturday.
In the clip, Bam is hanging with some random folks at a Pennsylvania bar and grill. Witnesses say he told them he was getting ready to fly to L.A. to check into rehab.
Jess clearly believes Bam did get on a plane to L.A., but he's not buying the rehab part.
Originally Published -- 8:35 AM PT