On Wednesday, Mexican TV channel Milenio published an article titled "Mexican cartels prepare for a war; they have military grade ROCKET LAUNCHER" that shows a video of a Gulf Cartel (Cartel Del Golfo, CDG) member carrying a "military-grade grenade launcher during a checkpoint in Matamoros, Tamaulipas." 

Milenio's Azucena Uresti identified the rocket launcher as a Raytheon-made FGM-148 Javelin. She noted the rocket launcher on the black market fetches anywhere from $20,000 to $60,000. 

After further review, the rocket launcher might be an AT-4, a Swedish-made disposable anti-tank launcher, which was also sent to Ukraine with Javelins. Nevertheless, these military-grade weapons are turning up in Mexican border towns during the worst US southern border crisis in history. 

Matamoros directly borders Brownsville, Texas. 

But don't worry because the Biden administration repeatedly states everything is fine on the border.