A political ad plastered on the side of RTD buses for the last few weeks are being criticized as offensive and anti-Islamic.

The ads read: "19,757 Deadly Islamic Attacks Since 9/11/01. It's Not Islamophobia, It's Islamorealism. This Ad Paid For By The American Freedom Defense Initiative."

The ads are on 10 RTD buses in the Denver area. They are paid for by the American Freedom Defense Initiative.

The group pays to advertise on public transit around the country raising awareness to what they say is the greatest threat to national security: Islamic extremism.

RTD says it has received around a dozen complaints about the ads, which they say is fairly normal for controversial ads.

RTD spokesperson Scott Reed says the transit system does not endorse or promote any advertisements on its buses.