Keep a look out for suspicious situations, such as an unattended luggage or someone with a visibly high degree of interest in a building's security, to assist lower the risk of a terrorist strike.
In public places, be cautious.
In places where there are a lot of people, such as metro and railway stations, festivals and performance sites, and retail malls, be especially cautious.
In every building you visit, double-check the placement of the emergency exits.
Don't forget to keep an eye on your valuables.
The context plays a big role in determining whether or not a scenario appears suspicious. An abandoned luggage on a train platform, for example, does not always indicate something terrible. Still, the best course of action is to immediately alert a member of staff. Alternatively, you can contact the authorities.