Jan M. Olsen and Karl Ritter, The Associated Press Published Sunday, February 15, 2015 7:32AM EST Last Updated Sunday, February 15, 2015 9:04PM EST

COPENHAGEN, Denmark -- The slain gunman suspected in the deadly Copenhagen attacks was a 22-year-old with a history of violence and may have been inspired by Islamic terrorists -- and possibly the Charlie Hebdo massacre in Paris, Danish authorities said Sunday.

Prime Minister Helle Thorning-Schmidt mourned the two people killed and vowed to protect freedom of speech and Denmark's Jewish community.

The suspect was killed in a gunbattle with a SWAT team early Sunday. He had opened fire Saturday at a cultural centre hosting a seminar on free speech with an artist who had caricatured the Prophet Muhammad and then later at security forces outside a synagogue, police said.

A Danish filmmaker was killed in the first attack. Nine hours later, a security guard protecting a bat mitzvah near a synagogue was slain. Five police officers were wounded in the shootings.

Jens Madsen, head of the Danish intelligence agency PET, said investigators believe the gunman "could have been inspired by the events in Paris." Last month Islamic militants carried out a massacre at the French satirical newspaper Charlie Hebdo followed by an attack on Jews at a kosher grocery, killing 17 people.

"He could also have been inspired by material sent out by (the Islamic State group) and others," Madsen said.

Copenhagen police made no mention of Islamic extremism and said the Danish-born suspect had a history of violence and weapons offences and connections to a criminal gang. They didn't release his name.

"Denmark has been hit by terror," Thorning-Schmidt said. "We do not know the motive for the alleged perpetrator's actions, but we know that there are forces that want to hurt Denmark. They want to rebuke our freedom of speech."

Chief Rabbi Jair Melchior identified the security guard as Dan Uzan, a 27-year-old member of Denmark's 7,000-strong Jewish community. Two police officers who were near the synagogue were slightly wounded.

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Radical Islamic link in Copenhagen attacks: Denmark intelligence chief