Swedish Prime Minister Stefan Lofven said the country has been attacked and that everything indicated that the truck driven into a crowd in central Stockholm was an act of terrorism, national news agency TT reported.
An area of central Stockholm was cordoned off and large numbers of police and emergency services were at the scene. The area was evacuated.
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"I saw at least three dead, but probably more," Swedish radio reporter Martin Svenningsen said.
A Reuters witness saw a number of body-like forms covered by blankets at the scene of the incident.
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One arrested
Swedish police said they have arrested one person in connection with a deadly truck attack.
"One person has been arrested who may be connected with the incident," police said in a statement.
Separately, news agency TT said police had confirmed that four people had been killed in the attack, which also left more than a dozen injured.
The worst attack was last year in France on the Bastille Day national holiday of July 14, in which a man rammed a truck into a crowd in the Mediterranean resort of Nice, killing 86 people.
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