OTTAWA – The Chair of Ottawa’s Transit Commission is calling for a review of OC Transpo’s advertisement policies.

Diane Deans call comes after about 300 OC Transpo buses started running ads that question what happened during the World Trade Centre attacks on September 11, 2001.

The posters which read “Did you know a 3rd tower fell on 9/11?” are funded by an organization called “ReThink9/11.”

The group has said it does not accept the official explanation of the attacks and is demanding an investigation.

It launched a global public awareness campaign at the beginning of September and has put up posters in a number high-profile spots, including a 54-foot-tall billboard in New York’s Times Square.

This week marked the 12th anniversary of the attacks.