Swedish police have arrested another suspect in the murder of Foreign Minister Anna Lindh, and released a man they had held in custody for more than a week.

Swedish police were tonight given another week to hold the main suspect in the murder of Foreign Minister Anna Lindh as they seek evidence implicating him in her death.

Stockholm was placed under tight security today, with hundreds of police in the streets of the Swedish capital to protect foreign leaders at a memorial service for murdered Foreign Minister Anna Lindh.