and to be perfectly honest, that is what has driven me to this. >> and so on what should have been a routine day, alexis killed 12 people, mothers, fathers, sons, daughters. >> they never had a chance, and still no answers as to why so many red flags were missed. pierre thomas, abc news, washington. the state department is renewing its global terror alert after the mall attack in kenya. the advisory reminds americans worldwide to be vigilant in light of the potential threat against the u.s. citizens and interests. terrorists could use a variety of tactics from hijacking to suicide operations. potential targets include large public places where americans overseas might gather. >> we are getting a clearer picture of how sophisticated that terror plot in nairobi was. the group that calmly gunned down innocent civilians rented a store inside the mall for three months. it was used as a base to plan the attack and to stash weapons.