Three suspects have been arrested in connection with the deadly firebomb attacks that targeted the homes of members of Greece’s ruling New Democracy party in the northern city of Thessaloniki on July 1, police said Friday.

The arrests followed counterterrorism operations in Thessaloniki and on the southern island of Crete, police said, adding that the investigation is ongoing.

One person was killed and three others were injured in the pre-dawn attacks, which involved improvised explosive devices made from camping gas canisters.

This is an ongoing story.