Politics Factbox: What is known about suspected chemical weapons attack in Syria Updated : April 16, 2018 08:45 AM IST The officials said they had videos and photos showing the remnants of at least two chlorine barrel bombs. Eyewitnesses reported multiple government helicopters over Douma on April 7th, and said barrel bombs were dropped. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.