november s paris terror attacks. we all stand together with our allies, belgium, on this dark day. reporter: in a show of solidarity and defiance, streets of brussels are covered with messages of hope and prayers for victims, including the three americans from utah recovkov ec from injuries. president obama condemned the attack from cuba. we will do whatever is necessary to support our friend and ally belgium in bringing together those who are responsible to justice. reporter: police have found explosive devices and an isis flag. outside the stock exchange building in brussels, people are writing messages of hope, peace, and anger. hundreds gathered for a candle light vigil. a memorial has been set up with hundreds of flowers for the victims. the world is standing behind belgium tonight and several international monuments are honoring them. this is the eiffel tower in paris. a large crowd turned out in rome, also lit up in the colors of the belgian flag. this is the