Sweden’s intelligence service has said that the investigation into a foiled attack on the Israeli embassy in Stockholm this week was being probed as a potential “terrorist crime”, Reuters reports.

Police were called to the embassy on Wednesday after a “dangerous object” was discovered on its grounds, which the national bomb squad destroyed after determining it was “live”.

Police declined to comment on what the object was but media have reported it was a hand grenade.

“The preliminary investigation launched by the Swedish Police Authority on January 31, following the discovery of a dangerous object at the Israeli Embassy in Stockholm, has been taken over by the Swedish Security Service,” the service said in a statement.

“In connection with this, the criminal classification has been changed to a terrorist crime,” it added.