(JTA) — Three people were reportedly shot in an attack at a synagogue in Copenhagen, Denmark.

The shooting occurred just hours after a fatal shooting at an event featuring a Danish cartoonist, Lars Vilks, who is under police protection because of his cartoons caricaturing Mohammed. It is not yet clear if the two shootings are related.

Multiple reports said two policemen and a civilian were shot in the synagogue attack, which reportedly occurred shortly after midnight on Saturday. A civilian was killed and three policemen were wounded in the earlier attack at a cafe.

Helle Thorning-Schmidt, the Danish prime minister, said the attack on the cafe was a terrorist attack. Copenhagen was on high alert.

The Secure Community Network, the security arm of the U.S. Jewish community, was in touch with its European counterparts, its director, Paul Goldenberg, told JTA.