Tekashi69's Manager Investigated for Shootings Day of Broner Fight

Tekashi69's manager is under criminal investigation for two shootings that went down the day of Adrien Broner's fight ... and the moments leading up to the incident were caught on tape.

Law enforcement sources tell us 6ix9ine's manager, Tr3yway, is a person of interest in two separate gun-related incidents over the weekend -- one that occurred during the Broner fight, and another that went down just hours earlier on the streets of Brooklyn.

We're told police believe Tr3yway might be the person who fired a shot inside the Barclays Center after a fight broke out with Casanova's crew, based on surveillance video. They also think he might've been the guy who fired two shots 4 hours beforehand, when he was allegedly captured on video shooting at a car following Tekashi's SUV.

Cops tell us the suspect in the footage from both incidents resembles Tr3yway -- who'd been hanging out with 6ix9ine and Foodgod, Jonathan Cheban, over the weekend ... who was filming his new show.

In the footage from outside the arena, obtained by TMZ, you see what eyewitnesses tell us is Tekashi's SUV presumably heading to Barclays. It stops suddenly, and a guy we're told is Tr3yway hops out and runs in the opposite direction ... at which point he allegedly fired.

Sources say Tekashi got out in the vid, as well, but you can't make out his face -- or hair -- 'cause he's got a hoodie on. Criminal charges have yet to be brought against Tr3yway. Still ... considering Tekashi's crew has been linked to a THIRD shooting this week ... they might wanna lay low.