The main suspect in the Stockholm truck attack is an Uzbek construction worker and father-of-four believed to have IS sympathies, who went underground to avoid deportation from Sweden, police and reports said on Sunday.
Media quoted his colleagues as saying he was not "particularly religious" and that he "partied and drank".
Swedish dailies Expressen and Aftonbladet meanwhile named the man as Rakhmat Akilov and published his picture on Sunday.
Four people were killed in the attack while 15 others were injured.
According to police Akilov applied for a permanent residency in 2014 but was rejected in 2016.
He did not respond to the deportation order and has been wanted by police since February 26.
It was reported several of Akilov’s Facebook contacts were linked to the Islamist group Hizb ut-Tahrir.
Akilov also reportedly posted IS propaganda films on his Facebook account and “liked” an image of the aftermath of the Boston marathon bombing on April 15, 2013.
But a woman who lived at an address where Akilov was also registered told Aftonbladet that he didn't come across as radicalised.
"He never talked about politics or religion," she said.
"He didn't pray five times a day from what I know."
On Sunday police said they had found components in a bag in the truck that could be used to make a "dangerous device".
Two men were arrested following Friday’s attack.