Gunfire erupted Saturday outside a building in Copenhagen where a debate on Islam and free speech was held, with the event including the author of controversial Prophet Mohammed cartoons and the French ambassador, reports said. Three police officer were reported wounded outside the building, while French ambassador Francois Zimeray, who was also there, said on Twitter that he was not harmed Two gunmen are said to be still at large. Reports say up to 40 shots were fired outside the venue in the Danish capital. Controversial Swedish cartoonist Lars Vilks, who has drawn caricatures of the Prophet Muhammad, was also present at the debate. The area around the venue, reportedly a cafe, is under lockdown. Police have erected cordons and are searching a nearby park, police sources said. Lars Vilks stoked controversy in 2007 by drawing pictures of the Prophet Muhammad dressed as a dog.