“Be aware of immediate surroundings and avoid large crowds or crowded places. Exercise particular caution during the holiday season and at holiday festivals or events,” the alert document says. The warning was generated based with information exchanged with allies about threats of international terrorism considering at the same time terrorist actions in the same period from the past years. The level of security measures is increased now in many other countries. As an example, Belgium’s prime minister announced that Brussels would remain at the highest alert level for at least another week. The battle against terrorism will be the most important objective for all countries in 2016.