Police say that an explosive device has damaged a Jewish congregation center in Sweden's third largest city, and that they have arrested two youths suspected of involvement in the attack.

No one was injured in the blast which broke windows of the entrance to the center in the southern city of Malmo on Friday. It comes amid growing safety concerns for the country's small Jewish community which says it feels increasingly threatened.

The Scandinavian country has seen a surge in reported hate crimes against Jews, including harassment, violence and vandalism, since Israel's invasion of Gaza in 2009. The government has earmarked funds to combat the issue after being criticized for not doing enough.

An estimated 20,000 Jews live in Sweden.