U.N. agency says displaced refugees from Yemen have arrived in Horn of Africa , asks everyone in area to be vigilant . WHO : At least 643 refugees have been killed , more than 2,000 wounded in three weeks . UNICEF : Aid includes medical care for up to 80,000 refugees and more hospitals are planned .
U.N. agency says 900 refugees from Yemen have arrived in Horn of Africa , asks ships in area to be vigilant . WHO : At least 643 people have been killed , more than 2,000 injured in three weeks . UNICEF : Aid includes medical supplies for up to 80,000 people and more airlifts are planned .