Last month Syrian President Bashar Al Assad gave an interview to the BBC. In it, he denied that his government had ever used barrel bombs to target Syrian civilians. He called the accusations “childish.” Barrel bombs are crude and highly explosive. they’re filled with scrap metal and nails which enhances their fragmentation when they explode Sometimes they’re even filled with chemicals like chlorine. Last week Doctors without Borders said that barrels filled with chlorine were dropped from helicopters in the town of Sarmin. In a recent Op-Ed that appeared in the New York Times, Dr. Hassan (he is using a pseudonym out of fear for his safety) wrote about the carnage he says he’s witnessed from barrel bombs. He called on the international community to stop them. He joins us to discuss the impact of the bombs on Syrian civilians. PHOTO: In this photo provided by the anti-government activist group Aleppo Media Center (AMC), which has been authenticated based on its contents and other AP reporting, Syrian men help survivors out of a destroyed building after a Syrian forces warplane’s attack in Aleppo, Syria, Saturday, Feb. 8, 2014. (AP Photo/Aleppo Media Center AMC)