The LAPD does not believe ex-NFL player Jonathan Martin‘s gun photo on Instagram was a harmless social media prank — they’re treating it as a “serious threat” … this according to sources directly involved in the investigation.
Multiple sources tell TMZ Sports … Martin recently purchased 2 firearms — and the gun pictured appears to match up with one of the guns he recently bought.
We’re told police are working with all 4 individuals tagged in Martin’s post to make sure they’re safe.
As we previously reported … Martin was detained by police Friday after word spread of his threatening post. Harvard-Westlake School in L.A. — which Martin also mentioned in his IG pic — cancelled classes Friday out of an abundance of caution.