The main suspect of Stockholm truck attack has confessed to committing a terrorist crime, his lawyer said at a Swedish court on Tuesday morning.

Rakhmat Akilov, a 39-year-old Uzbek national and failed asylum-seeker, was arrested in northern Stockholm on Friday, five hours after the terror attack in a busy shopping street of the city.

The Stockholm District Court ruled that Akilov should be detained pending trial for committing a terror offence. 

The evidence against a second person arrested on suspicion of involvement in Friday's attack turned out on Tuesday not to be strong enough to keep him in detention. However, he will not be set free since he had previously received a deportation order.

A truck rammed into crowds on a central Stockholm street on Friday before crashing into a department store, killing four people and injuring 15 others.

(Source: Agencies)