Italian police said on Monday they had arrested a 20-year-old Somali man suspected of having been a member of Islamic State and who had threatened to bomb churches in Italy, including St. Peter's Basilica in the Vatican.

Prosecutors say a Hawaii-based solider who swore an oath of loyalty to the Islamic State group wanted to take his rifle and go shooting in downtown Honolulu and Waikiki.

An email warning about Aaron Driver's potential suicide bombing was sent out to several major security firms Wednesday evening.