Montenegrin Prime Minister Milojko Spajic called the rampage a "terrible tragedy" and declared three days of national mourning.

Shock and dismay prevails in Montenegro after a gunman fatally shot 12 people including two children in a western town before killing himself

The U.S. Army veteran who drove a pickup truck into a crowd of New Year's revelers acted alone, the FBI said Thursday, reversing its position from a day earlier that he likely worked with others in the deadly attack that officials said was inspired by the Islamic State group.

The suspect in the New Year’s Day truck attack on Bourbon Street acted as a lone wolf when he slammed his vehicle into a crowd, killing 14 and injuring dozens of others, the FBI said Thursday.

The U.S. Army veteran who drove a pickup truck into a crowd of New Year’s revelers acted alone, the FBI said Thursday, reversing its position from a day earlier that he likely worked with others in carrying out the deadly attack, which officials say was an act of terrorism inspired by the Islamic State group.