Three people have been killed and three more injured when a bus hit a bus stop in central Stockholm, Swedish police say, adding that they had no information pointing to it being an attack.

There was no information pointing to it being an attack. a spokesperson for Stockholm's rescue services said on Thursday.

The spokesperson said there were no passengers on the bus at the time.

"It is being investigated as involuntary manslaughter. The bus driver has been arrested but that is routine in such an incident," a police spokesperson said, adding they had no information pointing to it being an attack.

Police said they would not yet comment on the gender or ages of those killed or injured.

Police, rescue services and ambulances were working at the scene, police said.

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