Foam is the most effective means of extinguishing a fire, but it contains toxic chemicals. Chemists at the University of Cologne have developed a new, low-toxicity firefighting foam based on renewable materials.
The chemical weapons watchdog OPCW said sarin was used in an attack on a northern Syrian town five days before the banned nerve agent killed dozens in Khan Sheikhoun, prompting global outrage.
Tests on victims of a suspected chemical attack in Syria's northwestern Idlib province have confirmed the use of deadly sarin gas. Syria's president, Bashar al-Assad, has denied accusations that Damascus was responsible.
Investigators in the western German town of Ludwigshafen are still trying to determine the cause of the explosion at the BASF chemical plant. Two people were killed, one remains missing and six were severely injured.
A monitor has reported that dozens of civilians were killed and hundreds injured by a "toxic gas" attack in northwestern Idlib province. The Syrian government had vowed to destroy its stock of chemical weapons in 2013.
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