At least one gunman opened fire Saturday on a Copenhagen cafe, killing one man in what authorities called a likely "terror attack" during a free speech event organised by an artist who had caricatured the Prophet Muhammad. <br /> <br />The shooting, which also wounded three police officers, came a month after extremists killed 12 people at a satirical newspaper in Paris that had also sparked Muslim outrage with its depictions of Muhammad. <br /> <br />Swedish artist Lars Vilks, who has been repeatedly threatened after depicting Muhammad as a dog in 2007, organised and attended Saturday's event but was not hit by gunfire, police said. <br /> <br />There was no immediate claim of responsibility for the shooting, which took place shortly before 4 p.m. (1500 GMT). <br /> <br />Denmark's security service, PET, said the circumstances surrounding the shooting "indicate that we are talking about a terror attack." <br /> <br />Danish police said the gunman used an automatic weapon to shoot through the windows of the Krudttoenden cafe, which TV footage showed were riddled with bullet holes. <br /> <br />The gunman then fled in a carjacked Volkswagen Polo that was found later a few kilometres (miles) away, police said. <br /> <br />Police initially said there were two gunmen but later said they believed there was only one shooter, and described him as 25-30 years old with an athletic build, and carrying a black automatic weapon. <br /> <br />The Copenhagen event, titled "Art, blasphemy and freedom of expression" featured a panel discussion about freedom of speech in the wake of the January 7 massacre at the Charlie Hebdo paper in Paris. <br /> <br />Danish police said the victim Saturday was a 40-year-old man who was inside the cafe attending the event. <br /> <br />He has not yet been identified.