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Ahead of Sweden's Walpurgis festival to mark the start of spring, young people were busy selecting outfits or getting their hair done.

Celebrated nationwide, Uppsala hosts the country's largest and most high-profile Walpurgis events, popular with students.

People intending to visit Uppsala for the Walpurgis festival were advised not to change their plans, as police promised extra resources on the cathedral city's streets and suggested the shooting was likely an "isolated incident".

The attack came on the eve of the Walpurgis spring festival, when large crowds descended on the streets of Uppsala.

The attack came on the eve of the Walpurgis spring festival, when large crowds are expected to descend on the streets of Uppsala, a university town north of Stockholm.