A total of 25 AR-15 rifles are missing from the Miami Police Department, according to CBS4’s news partner the Miami Herald.

An internal memo obtained by the Miami Herald was sent out Wednesday morning listing serial numbers of the missing rifles, along with a warning that if the guns were not returned no later than Monday, they will be reported stolen.

“The city of Miami Police Department is a large police agency, they are responsible for thousands of thousands upon pieces of property, so this is just one prime example of property that unfortunately is unaccounted for,” said Stuart Kapman, a former FBI Special Agent.