Not much is known other than a vehicle has mowed down some pedestrians, there are reports of shots fired, and it is reported that authorities are treating it as terrorism-related.

Grim scene in #Stockholm. Bodies of victims lie in the street after being run down by truck. https://t.co/flaOBmxfKh pic.twitter.com/eeFUKbPFDZ

— Jim Roberts (@nycjim) April 7, 2017

#Stockholm truck crash: separate reports emerge of shots fired in other areas of city pic.twitter.com/jnee2kz8Ho

— SkyNews (@SkyNews) April 7, 2017

#Stockholm truck crash: Swedish Police are treating the incident as a possible terror attack – SVT channel https://t.co/kn38ue5m5A pic.twitter.com/qQrPxMk3le

— The Telegraph (@Telegraph) April 7, 2017

#Stockholm – Just in: Shooting reported at second area in Stockholm which is 20 minutes away from first location. #Skynews pic.twitter.com/rCSQKmQ8X1

— Sven Herold (@svenherold) April 7, 2017

#TerroristAttack in #Stockholm (Sweden). The police are wearing gas masks. Are the police waiting for a chemical attack? pic.twitter.com/mT5ATuo22F

— Pavel Кulyuk (@Paveluljuk) April 7, 2017