Former Georgia running back Isaiah Crowell made headlines when he posted on his Instagram account a photo of a police officer getting his throat slashed by a faceless attacker dressed in black.

Though Crowell, who now plays for the Cleveland Browns, has since apologized for posting the message, the president of Cleveland’s police union is considering telling his officers not to provide security at Browns games unless Crowell apologizes further, Cory Shaffer of Cleveland.com reported.

Crowell did call Cleveland police chief Calvin Williams to issue an apology, according to the report, and Williams said he accepted the apology and called him “very contrite.”

However, Steve Loomis, the police union president, said he wants Crowell to apologize to family members of the five police officers killed in Dallas last week and to donate to their families. If that doesn’t happen, he wants the Browns or NFL to take action against the running back. Failing those things, Loomis said he would instruct his officers not to work security for the team.

The Browns released a statement regarding Crowell, saying, “We have spoken to Isaiah regarding his extremely disturbing and unacceptable social media decision. It was completely inappropriate and we have made him aware of our high level of disappointment. Isaiah has apologized but also knows that just an apology is insufficient and that he must take steps to make a positive difference after a very negative and impactful post.”