Starbucks has issued an apology after six police officers were asked to leave one of its stores in Tempe, Arizona, on July 4 because a customer complained of not feeling safe with them there.

The officers were drinking coffee at the Starbucks before starting their shifts when an employee, who knew one of the officers because he was a regular, asked them to move out of the customers line of sight or leave, according to the Tempe Officers Association.

The barista told the officers that the unidentified customer did not feel safe in their presence, the police union said in a statement on Twitter.

The officers left.