New York City buses are carrying an advertisement protesting the planned construction of a mosque near the site of the September 11 attacks in 2001.
On Thursday, 26 buses with the anti-mosque ad posted on the side were operating in the city.
The planned construction of a Muslim cultural and prayer center near the destroyed World Trade Center has triggered strong opposition, mainly from the families of those killed in the attacks.
The advertisement created by an anti-Muslim group asks "Why there?" and depicts a plane crashing into one of the twin towers.
The construction plan has triggered a heated debate that has only grown since President Barack Obama expressed his support for the mosque last Friday.
A man in his 30s said New York is a melting pot of ethnic groups and that Muslims have a perfect right to construct the mosque. He said the ad is a symbol of an overreaction.
Another man in his 40s said freedom of religion must be protected, but that the site is not appropriate for a mosque because it will offend the feelings of the victims' families.