DUBLIN: Irish police have arrested seven Muslims suspected of conspiracy to murder over an alleged plot to kill a Swedish cartoonist who drew the Prophet Mohammed with the body of a dog, they said.

The four men and three women were arrested Tuesday in the southern towns of Cork and Waterford in an operation coordinated with US and European security agencies.

Police said that they were Muslims arrested over an alleged plot to assassinate Swedish cartoonist Lars Vilks, who has a 100,000-dollar (74,000-euro) bounty on his head from an Al-Qaeda-linked group.

"The operation... is part of an investigation into a conspiracy to commit a serious offence (namely, conspiracy to murder an individual in another jurisdiction)," said a statement from Ireland's national police service.

Vilks was unfazed by the arrests or the threats on his life, however.

"I'm not shaking with fear, exactly," he told Swedish news agency TT.

"I have prepared in different ways and I have an axe here in case someone should manage to get in through the window," he added.Related article:Threatened cartoonist says 'not shaking with fear'

Vilks said he had received threatening phone calls from Somalia at the beginning of the year and that the Swedish security police, Saepo, had since warned him there was a heightened threat level against him.

"But I didn't think it was that serious," he told TT.

Saepo spokesman Mattias Lindholm confirmed it had been aware of Tuesday's arrests but refused to comment on any threat to Vilks.

"Right now we are in continuous touch with the authorities involved, including our Irish counterparts," he told AFP, adding: "I cannot say anything about any possible threats against any individuals, for security reasons."

The seven people arrested range in age from mid 20s to late 40s, Irish police said. State broadcaster RTE reported that they were originally from Morocco and Yemen, but were all legally in Ireland.

They could be held for questioning without charge for up to seven days.

Police had been monitoring them for the past five months, RTE said, adding that 60 detectives were involved in raids Tuesday which resulted in the seizure of documents, computers and mobile phones.

Vilks began receiving death threats after his cartoon depicting the Prophet Mohammed as a dog appeared in Swedish newspaper Nerikes Allehanda on August 18, 2007, alongside an editorial on freedom of expression and religion.

The cartoon prompted protests by Muslims in the town of Oerebro, west of Stockholm, where the newspaper is based, while Egypt, Iran and Pakistan made formal complaints.

An Al-Qaeda front organisation then offered 100,000 dollars for Vilks' murder -- with an extra 50,000 if his throat was slit -- and 50,000 dollars for the death of Nerikes Allehanda, editor-in-chief Ulf Johansson.

The protests in Sweden echoed the uproar caused in Denmark by the publication in September 2005 of 12 drawings focused on Islam, including one with the Prophet Mohammed with a turban in the shape of a bomb.

Muslims worldwide took to the streets in protest, angered both by the association of their religion with terrorism and by the showing of images of Mohammed, which many consider blasphemous in themselves.

In February 2008, Danish police said they had foiled a plot to murder the cartoonist behind the bomb drawing, Kurt Westergaard, while another attempt on his life was allegedly made by a Somali man in January.

Vilks has in the past dismissed the threats against him as "scare tactics" and, supported by the Swedish media, has insisted on the importance of publishing such material in defence of Sweden's freedom of expression.

He even announced in 2007 that he had begun working on a musical based on the drawing, called "Dogs".