Rob Kardashian is currently being investigated by the police.
The LAPD confirmed to ET on Thursday that the 29-year-old reality star is being investigated by the department's Threat Management Unit.
"Last night North Hollywood took a crime report naming Rob Kardashian as a suspect in a criminal threats report," Media Relations officer Tony Im tells ET. "Threat Management is aware and is looking into the incident."
One alleged text message from Rob to Pilot reads, "Leave my wife alone. I'm not playing with you."
Law enforcement sources tell TMZ that while there are other texts in which Rob generally threatens Pilot with physical harm, the threat is "a little murky and general."
Rob and Chyna have been open about their relationship issues, though the two looked happy during a Disneyland outing just this Sunday. The couple visited the theme park with Chyna's 4-year-old son, King Cairo, as well as her best friend, Amber Rose, and Rose's son with ex-husband Wiz Khalifa, 3-year-old Sebastian.
The often camera-shy Rob even smiled for a cute Instagram snap.
"I know that Rob and Chyna have, like, an unstable relationship," Kim tells the cameras. "They just know how to push each other's buttons, and my brother just shuts down and doesn't really tell us because he doesn't want us to turn against him, or against her. So instead, he just comes up with all of these excuses."