Vietnam condemns truck attack in Sweden's capital

Nevertheless, police say Akilov was "sympathetic to extremist organizations", including the Islamic State.

"Police have arrested a person and we have appointed a public defender", Helga Hullmann, judge at the Stockholm District Court said.

Two Swedes, a Belgian and a British man were killed in the attack on Friday. Ten of the injured people remained in hospital, two of them in intensive care, Stockholm authorities said.

A concrete traffic stopper called "Stockholmslejon" lays on its side outside the cordoned off area next to the department store Ahlens following a suspected terror attack on the Drottninggatan Street in central Stockholm, Sweden, Saturday April 8, 2017.

Authorities confirmed that the suspect was known to security services and described him as a "marginal character".

A second person was arrested on the same potential charge Sunday, and four others were being held by police.

Four people died and 15 were injured when a stolen beer truck was driven down the busy pedestrian Drottninggatan street in the heart of the capital.

"Unfortunately, there have been clear signs that it was just a question of time before the next attack would hit Sweden", he said.

Prosecutor Hans Ihrman said the suspect has not yet spoken to authorities and could not confirm whether he was a legal resident of Sweden.

The driver fled from the truck, prompting lockdowns at Parliament and the city's subway system as police looked for the suspect.

Sweden is statistically one of the safest nations in the world, and the country's prime minister and Stockholm's mayor have both vowed that the attack will not damage the country and city's open society.

Soderberg said Sunday that "an important task" for caregivers is to continue giving "long-term psychological support to those who need it" after the attack that killed four people Friday.

An Uzbek man suspected of being the driver of the hijacked delivery truck was arrested several hours after the attack.

IS also claimed responsibility for a truck attack that killed 86 people in Nice, France, in July 2016, as well as another that killed 12 people at a Christmas market previous year in Berlin.

Photos from the scene showed a beer truck sticking out of the department store, and Aftonbladet daily reported that Swedish beer maker Spendrups said one of its trucks had been carjacked earlier Friday.