Terrorists have taken to driving massive vehicles into large crowds to cause massive deaths and injuries. They have carried out these types of crimes before in France, Germany, and the UK.
This time it was Sweden, which remains in mourning after a hijacked truck crashed into a department store and killed at least four people in central Stockholm.
Public safety authorities arrested a suspect, who is thought to be the driver, but would not confirm or deny reports that police had found a bag containing explosives in the truck.
Following the incident, Stockholm was at a virtual standstill as bus and subways systems shut down. It's most significant attack in the country since December 2010, when an Iraqi-born Swede detonated two devices, including one that killed him.
Live: The terrorist attack in Stockholm http://www.dn.se/nyheter/sverige/live-terrorattacken-i-stockholm/
Stockholm: Man held on suspicion of terrorism @CNN http://cnn.it/2oMGJHl
BBC News - Stockholm attack: 'Suspect device' in Sweden crash lorry http://www.bbc.com/news/world-europe-39539689
Sweden identifies truck attack suspect as Uzbek native, 39 http://apne.ws/2nO07P2
Stockholm Truck Attack Kills 4; Terrorism Is Suspected https://nyti.ms/2oaiAbT
Stockholm truck attack kills 4; suspect held on suspicion of terror @CNN http://cnn.it/2nLad32