Rob Kardashain is currently under criminal investigation for allegedly threatening his fiancé Blac Chyna's former lover, Pilot Jones.

According to TMZ, law enforcement sources reveal that Rob allegedly threatened Jones in a harmful way. 

These reports come days after photos surfaced of Chyna and Pilot making out.

Pilot is reportedly scared, as Rob sent him a string of text messages, with one reading, "Leave my wife alone. I'm not playing with you."

TMZ also reports that there are other text messages where the reality star threatened Jones physically if he doesn't stay away from his fiancé. Law enforcement sources say, however, that the threat is "a little murky and general."

The LAPD's Threat Management Unit is reportedly investigating.

Get the latest drama between the couple in the BET Breaks video above.