Swedish police have said there is so far no sign of foul play in the car crash that killed cartoonist Lars Vilks.
The 75-yerar-old died together with two police bodyguards in a collision with an oncoming truck near the small town of Markaryd in southern Sweden last night.
Mr Vilks lived under protection after his 2007 depiction of the Prophet Muhammad prompted death threats.
"We want to completely exclude an external act targeting the car in which Lars Vilks found himself," Stefan Sinteus, chief of the South Sweden regional investigation unit, told a press conference.
"There is nothing to indicate that, but we want to be certain so we can rule it out," he added.
Police said they have yet to determine the reason why the vehicle that was carrying Mr Vilks and the two officers swerved off the road, breaking through a metal barrier before hitting a truck travelling in the opposite direction in the oncoming lane.
A tyre explosion is one of the hypotheses. Both vehicles then caught fire and all three men died at the scene.
The driver of the truck was injured and taken to hospital where he was questioned by investigators.
Mr Vilks lived under almost continuous police protection due to numerous threats and attacks from Islamists after his 2007 caricature depicting Muhammad was published in a Swedish newspaper.
But this morning, police said there had been no new concrete threats against him recently.
On 14 February 2015, a young Danish man of Palestinian origin opened fire when he tried to storm a debate on freedom of expression in Copenhagen, which was organised after the deadly attack on the Paris offices of satirical magazine Charlie Hebdo.
Mr Vilks escaped unharmed but a 55-year-old Danish film director and a guard at Copenhagen synagogue were both shot dead by the gunman, who was himself killed in a stand-off with Danish police.
