COPENHAGEN, Denmark - A gunman opened fire on a Copenhagen cultural center, killing one man and wounding three police officers in what authorities called a terror attack against a free speech event featuring an artist who had caricatured the Prophet Muhammad.

After searching for the gunman for hours, police reported another shooting near a synagogue in downtown Copenhagen after midnight Sunday. One person was shot in the head and two police officers were shot in the arms and legs, police said, adding it wasn't clear whether the two incidents were linked. The gunman fled on foot.

Sebastian Zepeda, a 19-year-old visitor from London, said he didn't want to leave his hotel room after hearing of the first shooting and was text messaging with his mother when the second shooting happened on the street below.

"I was on my bed and I heard gunshots. And my heart raced," Zepeda said. "All of a sudden the road was packed with police."

Witnesses in a bar across the street from the synagogue said they saw special police teams moving in with automatic rifles.

"We looked out the window and saw this guy lying on the street," said Rasmus Thau Riddersholm, 33. "We were told by police to stay in the back of the room, away from the windows and doors."

The earlier shooting came a month after extremists killed 12 people at a satirical newspaper in Paris that had sparked Muslim outrage with its depictions of Muhammad.

There was no immediate claim of responsibility for the first shooting, which took place shortly before 4 p.m. Saturday. Danish police said the gunman used an automatic weapon to shoot through the windows of the Krudttoenden cultural center, which TV footage showed were riddled with bullet holes.

The gunman then fled in a carjacked Volkswagen Polo that was found later a few kilometers (miles) away, police said.

They said the victim was a man about 40 who was inside the cultural center. He has not yet been identified. Two of the wounded officers belonged to the Danish security service PET, which said the circumstances surrounding the shooting "indicate that we are talking about a terror attack."

Lars Vilks, a Swedish artist who has faced numerous death threats for caricaturing the Prophet Muhammad, was one of the main speakers at Saturday's panel discussion, titled "Art, blasphemy and freedom of expression." He was whisked away by his bodyguards unharmed as the shooting began.

Vilks, 68, later told The Associated Press he believed he was the intended target of the shooting.

"What other motive could there be? It's possible it was inspired by Charlie Hebdo," he said, referring to the Jan. 7 attack by Islamic extremists on the French newspaper.

"At first there was panic. People crawled down under tables," Vilks said. "My bodyguards quickly pulled me away."

The cultural center had a lecture hall as well as a cafe. Vilks said no one in the hall was wounded.

"We were well isolated in there. It would have been much worse if this happened during the break, when people walk out," Vilks said.

He said he deplored the death and the injuries but was unfazed as to what it meant for his own safety.

"I'm not shaken at all by this incident. Not the least," he told AP by phone.

Police initially said there were two gunmen but later said they believed there was only one shooter. They described him as 25 to 30 years old with an athletic build and carrying a black automatic weapon. They released a blurred photograph of the suspect wearing dark clothes and a scarf covering part of his face.

"I saw a masked man running past," said Helle Merete Brix, one of the event's organizers. "I clearly consider this as an attack on Lars Vilks."

Niels Ivar Larsen, one of the speakers at the event, told the TV2 channel he heard someone shouting and firing automatic weapons. "Police returned the fire and I hid behind the bar. I felt surreal, like in a movie," Larsen said.

Visiting the scene of the first shooting, Danish Prime Minister Helle Thorning-Schmidt called it a "political attack and therefore an act of terror."

Police spokesman Joergen Skov said it was possible the gunman had planned the "same scenario" as in the Charlie Hebdo massacre.