PHILADELPHIA (CBS) — Authorities are working to figure out who spray-painted an “anti-police” message on a garage door in Old City Philadelphia.

It was discovered around 6 a.m. Sunday on Bank Street between Market and Chestnut Streets.

READ MORE: Thousands Protest Outside Philadelphia City Hall After Supreme Court Overturns Roe v. Wade

The graffiti, spray-painted in red, reads “Cop Lives Don’t Matter.”

READ MORE: Supreme Court Overturns Roe v. Wade, Allowing States To Ban Abortion

It’s unclear when the vandalism actually happened.

MORE NEWS: Roe v. Wade Overturned: Officials In Philadelphia Region React To Supreme Court Ruling Allowing States To Ban Abortion

Police are investigating.