Were being evacuated. A heart breaking scene in the metro there after the explosion, the child crying for her parents. Wondering what just happened. Probably two innocent and too young to understand that someone had just tried to kill her and everyone else. Belgium raised the terrorism alert to its highest level and declared three days of national mourning. Here is a timeline. At 8 00 a. M. In belgium, two explosions in the airport and an hour later on third explosion at the metro and that station is in a neighborhood filled with european power and blocks from the European Commission headquarters and the parliament buildings. Tom vacar is at San Francisco International Airport after talking about ways to prevent an attack here. Tara moriarty is in france. And we start first with cristina rendon. It is about one a. M. Wednesday morning in belgium. Authorities have been carrying out raise across the country through the attacks and fearing another attack. And the search is on for one of t