Metropolitan Anthimos of Thessaloniki, the city's archbishop who was officiating at another church, said about 30 people burst into the cathedral of St. Gregory Palamas and, aside from interrupting the Mass, "destroyed what they could." He did not elaborate.
The cathedral is named after a 14th-century archbishop of Thessaloniki who is revered in the Eastern Orthodox Church. Police say those arrested included 19 men and 7 women. Seventeen are Greek, with the rest from Germany, England, Austria, Switzerland and Morocco.
One of the buildings, formerly an orphanage, is the property of the Greek Orthodox Church and is being demolished to build a hospice for the terminally ill, Anthimos said. Police arrested 74 anarchists in that operation, 64 of them foreigners. The 33 refugees were released.
Before dawn today, an improvised device exploded outside the offices of the construction company demolishing the church's property but did little damage.