The local police force confirmed that it was a crime (although qualified it with 'technically' whilst insultingly comparing it to posting notices for missing animals, probably because of institutional race and cultural bias).
A hate crime is a criminal offence in which the victim was intentionally selected because of the offender’s bias against a race, religion, disability, sexual orientation, ethnicity, national origin, gender, or gender identity. As sociology scholars have confirmed that Islamophobia is based in racism and given that these posters are a clear representation of the irrational white nationalist racism so prevalent in the US in recent years, what with them being a transparent attempt to incite hostility towards a marginalised minority, then this incident would be a hate crime.