Austria, France, and Italy have all issued warnings of potential terrorist threats to Europe by ISIS following the group’s Moscow concert hall attack that killed 139 people. The French government increased the country’s security alert to its highest level, which means more soldiers will be put on standby and ready to patrol sensitive sites, including schools. Says Italian Foreign Minister Antonio Tajani, “During the Easter holidays you will need to be very careful. We will always do the utmost to ensure the safety of citizens and tourists.”