The Stockholm terror attack suspect reportedly told police he had "achieved what he set out to do" and that his deadly truck rampage was "revenge for bombing ISIS".
Rakhmat Akilov, from Uzbekistan, was identified as the suspected driver of the hijacked beer truck which mowed down pedestrians in the Swedish capital.
The 39-year-old was arrested on suspicion of terrorism offences hours after the attack.
In interview Akilov, a father-of-four, admitted he had planned the attack even carrying out a recce of the pedestrian street he sped down, a police source told the Expressen newspaper.
Investigators also disclosed a "suspect device" was found inside the lorry which was reported by state media to be a "bag of explosives".
On Sunday, police revealed the suspect was an asylum seeker who applied for residency in Sweden in 2014 but had his application rejected in June last year.
Authorities said the man was wanted in relation to a deportation order and that he had displayed "sympathies" for terror groups, including ISIS.
He allegedly had links to the Islamist group Hizb ut-Tahrir, had an expertise in explosives, and worked for an asbestos removal company at one time, Expressen reported.
Police spokesman Jonas Hysing said: "We know that he showed sympathies for extremist organisations, among them Islamic State."
Police had been looking for Akilov since Sweden's Migration Agency gave him four weeks to leave the country in December.
Yesterday, a British father was named among the victims of the horrific attack.
Chris Bevington, 41, was one of four people killed when the out-of-control lorry mowed down pedestrians in a busy shopping district.
In a statement, he was described by relatives as a "talented, compassionate and caring" person.
A statement from his father John Bevington said: "We are all devastated by the untimely and tragic death of our talented, compassionate and caring son Chris.
"A wonderful husband, son, father, brother and close friend to many. The family requests absolute privacy at this incredibly difficult time to mourn his passing in peace."
Mr Bevington worked as a director with music streaming service Spotify and was based in Stockholm with his family.
Spotify's founder, Daniel Ek, paid tribute to Mr Bevington, who had worked for the company for five years.
Mr Ek wrote in a statement on Facebook: "It is with shock and a heavy heart that I can confirm that Chris Bevington from our Spotify team lost his life in Friday’s senseless attack on Stockholm.
"Chris has been a member of our band for over 5 years. He has had a great impact on not just the business but on everyone who had the privilege to know and work with him.
"There are no words for how missed he will be or for how sad we all are to have lost him like this."
He added: "Whilst this terrible news is sinking in, our primary focus is on supporting the family and loved ones of Chris in any way we possibly can."
Police identified all four victims which include two Swedes and a Belgian as well as the British man. Their families have all been informed.
The Foreign Office confirmed Mr Bevington was among the dead and it was helping his relatives both in Sweden and in the UK.
A spokesman said: “ Stockholm police have confirmed that a British man was killed during the attack in Stockholm.
"We are supporting his family in Sweden and in the UK. Our thoughts are with them and all those affected at this terrible time. We will stand shoulder to shoulder with Sweden as they deal with this tragedy.”
Another victim is reported to be an 11-year-old girl. The youngster was walking home from school when the lorry driver deliberately ran over people in the centre of the capital before crashing into a shop.
Relatives confirmed her identity to Swedish media.
And Belgian deputy prime minister Didier Reynders confirmed one of the country's citizens was also killed.
Swedish newspaper Expressen reported the Belgian victim was a 31-year-old woman who was visiting Stockholm as a tourist.
He tweeted: "We unfortunately lost a compatriot in Stockholm. I extend my condolences to his family and friends."
Fifteen people were injured in the attack in which a hijacked truck ploughed through pedestrians in the capital's shopping district.
Four of the wounded remain in a serious condition with two being treated in intensive care.
He had not been known as a militant threat by the security services before Friday's attack.
Police also said roughly five other people of interest to the investigation which included around 500 interviews.
Investigators also said a second person had been arrested over the atrocity and that a court has appointed them a legal representative.
Prosecutors said the man was held on suspicion of a "terrorist crime through murder" - the same grounds as the Uzbek suspect.