Uzbekistani Rakhmat Akilov, an asylum seeker in Sweden accused of a deadly truck attack in Stockholm in April 2017, is expected to appear in court next week.
He is suspected of having stolen the truck and driven it into a crowd of pedestrians in the Swedish capital, Stockholm, killing five people.
He faces "terrorism and attempted terrorism" in this process, which is expected to last until May of this year, while the decision is expected in June.
The trial is expected to focus on the motives of the accused, 39-year-old Rakhmat Akilov, and whether his attack was premeditated and religiously motivated.
His court appearance is expected on February 20.
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A joint investigation by Radio Free Europe's Uzbekistan and Tajikistan Services and Swedish news agency TT has found that Akilov was in direct contact with suspected Islamic State (IS) militants in Tajikistan before and after the deadly attack on April 7 last year.
The extremist group, Islamic State (IS), has not claimed responsibility for the attack in Stockholm.
Tajikistan's interior minister, Ramazon Rahimzoda, told Radio Free Europe/Radio Liberty that Swedish authorities have not been in contact with Tajikistan about Akilov's links to suspected Tajik members of the Islamic State militant group.
If convicted, Rakhman Akilov, who is in custody in Sweden, could be sentenced to life in prison.
Akilov, a construction worker, was arrested a few hours after the serious incident, and police said he confessed to the crime a day later, saying he wanted to hit "infidels" during the attack.
According to the investigation, Swedish police have found contacts with several people described as "related to terrorism" in messaging applications, such as Zello and Telegram, on Akilov's mobile phone.
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These contacts included false names such as Abu Aisha and Abu Umar, which Radio Free Europe has revealed were the same names used by suspected Islamic State recruits from Tajikistan.
Akilov is a member of the Tajik ethnic minority in Uzbekistan.
The correspondent of Radio Free Europe's Editorial Office for Uzbekistan, Sirojddin Tolibov, says that these were nicknames that only the top militants of the Islamic State could use.
Irina Zemanova, a 38-year-old Ukrainian, who lost the lower part of her right leg from the attack, told the AFP agency that it is important for her to attend the court and testify.
"I was walking down the street...you don't expect something like this to happen...all of a sudden, this truck ran over me," said Irina Zemanova.
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Several truck attacks have occurred in Europe and the United States in recent years.
The deadliest such attack was in Nice, France, on July 14, 2016, when a truck plowed into people celebrating a French national holiday, killing 86. The extremist group, the Islamic State, claimed responsibility for this attack.
