"Hans-Jakob Schindler, director of the Counter Extremism Project NGO, pointed out that violence online can lead to violence on the streets.

He said Sweden was the focus of an online campaign by Islamists that was intensifying risks for the Nordic country.

The German authorities arrested two brothers from Syria in April, the eldest of whom had allegedly planned to 'carry out an attack on a church in Sweden where many people (were) assembled'.

'This demonstrates that this ongoing Islamist online campaign against Sweden has effects and motivates individuals towards violence,' he said, pointing out that the Israel-Hamas conflict could have a similar effect.'"