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Forensic investigators stand near a blood-soaked vest outside Brussels Airport, in Zaventem, on March 23, 2016, a day after triple bomb attacks at the Brussels airport and at a subway train station killed 31 people and wounded more than 200.
World leaders united in condemning the carnage in Brussels and vowed to combat terrorism, after Islamic State bombers attacked the symbolic heart of the EU. / AFP / POOL / YORICK JANSENS        (Photo credit should read YORICK JANSENS/AFP/Getty Images)
Forensic investigators stand near a blood-soaked vest outside Brussels Airport, in Zaventem, on March 23, 2016, a day after triple bomb attacks at the Brussels airport and at a subway train station killed 31 people and wounded more than 200.
World leaders united in condemning the carnage in Brussels and vowed to combat terrorism, after Islamic State bombers attacked the symbolic heart of the EU. / AFP / POOL / YORICK JANSENS        (Photo credit should read YORICK JANSENS/AFP/Getty Images)

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U.S. doctor and friend treated Brussels victims

Dr. Laura Billiet and her friend Laura Harper tell CNN's Alisyn Camerota about helping the victims of the Brussels airport bombing.

U.S. doctor and friend treated Brussels victims

Dr. Laura Billiet and her friend Laura Harper tell CNN's Alisyn Camerota about helping the victims of the Brussels airport bombing.