A truck on Friday rammed into a departmental store in the centre of the Swedish capital Stockholm killing three people and injuring several.
Prime Minister Narendra Modi on Friday condemns the attack and said India stands firmly with the people of Sweden in this hour of grief.
"Sweden has been attacked. Everything indicates that this is a terror attack," Swedish Prime Minister Stefan Lofven told a press conference, Xinhua news agency reported.
Swedish police published a photo of an alleged truck driver, who was on the run after he rammed the vehicle over people. The picture was released by Swedish Security Service SAPO, according to Swedish Television.
The police said they have launched a manhunt, but did not know if this was an isolated incident or whether more could be expected.
Currently, Swedish National Rail company said that all trains to and from Stockholm Central Station have been cancelled.
Additionally, several lanes on the Oresund Bridge, connecting the Danish capital Copenhagen and the southern Swedish city of Malmo, have been shut down at the police request.
"So we have only two lanes for cars open in the direction of Denmark for the police to be able to control," police spokesperson Sanna Holmqvist told Swedish Television (SVT).
In Malmo, the police are now looking through and checking the trains on the way to Denmark, according to SVT.
All traffic around the Stockholm city, including subway and train, has been closed after the attack. Traffic barriers were put in place in many parts of Stockholm. Police have also urged people not to move to the Old Town, saying the people at the south part of the city should stay indoors.
Currently, the crime scene and the area around the Central Station in the centre of Stockholm is still cordoned off.
Many people in Stockholm's city centre were still trapped and remained in their offices or shops after the attack. The police would not give any clear recommendations about whether people should go home or stay.
Five different premises will be opened for those who are in the centre of Stockholm and can not go home because of the stopped underground traffic, wrote the Stockholm City on its website.
* External affairs minister Sushma Swaraj says all officials in the Indian embassy are safe.
* Emergency helpline number for Indians in Stockholm: 0768982764
* Swedish PM says everything indicates that a truck crash is 'a terror attack'
* The attack was merely metres away from the Indian embassy. All local and Indian staff are reported to be safe.
* Swedish government offices closed and all ministers are safe - source to Reuters
* Swedish police orders evacuation of central train station in Stockholm: report
* Stockholm metro shut down after attack: police
* India stands firmly with the people of Sweden in this hour of grief, says PM Modi
* Stockholm truck incident is an “attack on us all” – EU’s Jean Claude Juncker.
* According to Reuters, Swedish government offices have been closed and all ministers are safe.
* Reports suggest the lorry was stolen by assailant.
(With inputs from Agencies)