In 1914 a chemist called Fritz Haber offered his knowledge to the German Army. He soon began experimenting with chlorine gas to be used in trench warfare.

GRAND CANYON NATIONAL PARK, Ariz. – A chlorine gas leak at Grand Canyon National Park’s main water supply has forced park officials to close all inner canyon corridor trails. Officials said ...

Trails in Grand Canyon National Park were closed due to a chlorine gas leak. Chlorine is used as a disinfectant in the Roaring Springs area of the park. The trails have since reopened NORTH RIM ...

The closures are due to a chlorine gas leak at Roaring Springs. The closure impacts both day and overnight hikers. The public is being asked to avoid these trails for safety reasons. Park ...

The governor of Russia’s Astrakhan region told residents not to panic on Wednesday after its main city, close to a huge gas chemical complex that was attacked by Ukrainian drones this week, was ...

"Dear citizens, this morning the city was covered by a cloud of natural gas, which has a specific smell that appears after processing," he wrote on Telegram. "Specialists are carrying out ...

On the eve of World War One, as German forces demanded safe passage through Belgium on their way to attack France, the Belgian king refused to stand aside. What came next was unimaginable.

The National Park Service said on Wednesday evening that inner canyon corridor trails at the Grand Canyon were closed due to a chlorine gas leak at Roaring Springs. On Thursday, the leak was ...

GRAND CANYON VILLAGE, Ariz. — All inner canyon trails at the Grand Canyon reopened after a chlorine gas leak at Roaring Springs, the national park said on Thursday afternoon. The chlorine gas ...