The University of Michigan Police Department is looking into several threatening social media posts made by a former a player against the school’s head football coach Jim Harbaugh.

According to the Detroit Free Press, a UM police spokesperson confirmed that they were investigating a series of Tweets sent Monday night that originated from the personal Twitter account of former player Elysee Mbem-Bosse, a linebacker who came to Michigan as part of the freshman class of 2016.

School officials said Mbem-Bosse is no longer at the university.

“Elysee (Mbem-Bosse) left the football program in mid-November and is no longer with the team,” Michigan’s athletic department said Tuesday in a statement.

One of the tweets in question shows a picture of a text message saying, “Per Coach Harbaugh, you are hereby indefinitely suspended.” Tweets from the same account that were posted earlier in the week were far more threatening. “Michigan is open carry. Let’s not forget that. Not your friend,” one read. Another said: “They sent someone to my crib before. I was nice enough to call the cops next time I’m calling the morgue. I’m talking with facts.”

Yet another tagged Harbaugh’s offical Twitter account, saying, “And was suspended for going to take care of my family. You (expletive) (clown emoji).”

Mbem-Bosse played in seven games as a freshman in 2016 and appeared in four games last season. He was reportedly no longer with the team as of the Wolverines’ game against Maryland on Nov. 11.