MILAN –  Authorities in Italy and Kosovo have detained four Kosovars suspected of making threats against the pope and a U.S. diplomat.

Italian police said Tuesday that three were detained in Italy; one was being held while two were expelled under anti-terrorism measures. Kosovo police, meanwhile, arrested an ethnic Albanian south of Pristina who had a pistol and a rifle in his possession.

Authorities in the northern city of Brescia said that the suspects had posted on their Facebook pages images of themselves with weapons and "in circumstances characteristic of Islamic State fighters," and that all four often visited a jihadist Facebook group.

Police said their posts also included threats against the pope and a former U.S. ambassador to Kosovo, as well as celebrating the Paris attacks.