Um Ahmed, her husband, Abu Ahmed, and their two children sit inside a United Nations refugee registration center in Tripoli, Lebanon. They fled the northern Syrian city of Aleppo a month ago. "There was a lot of shelling," said Um Ahmed. "I wasn't thinking. I was just thinking of my children." Nicole Beemsterboer/NPR hide caption

itoggle caption Nicole Beemsterboer/NPR

Lebanese firefighters extinguish burning cars in Beirut following a huge bomb explosion. Hussein Malla/AP hide caption

itoggle caption Hussein Malla/AP