On April 22, 1915, a greenish fog drifted over the battlefield north of Ypres in Belgium, choking to death some 5,000 French soldiers and heralding a new type of terror on the Western Front. World War I saw the first widespread combat use of modern chemical weapons, starting with the 168 tons...

Slain journalist Jamal Khashoggi was about to disclose some detailed information about Saudi Arabia’s use of chemical weapons in Yemen and the U.K. had been made aware of a planned plot against him weeks before he was killed in the Saudi Consulate building in Istanbul, a British tabloid...

The United Nations envoy for Syria announced on Wednesday he will step down at the end of November after more than four years in the key post as UN efforts to end the seven-year war show no sign of a breakthrough. "I will myself be moving on as of the last week of November," Staffan de...

Saudi Arabia's stock market fell early Tuesday amid concern that international outrage over the disappearance of dissident journalist Jamal Khashoggi will hurt foreign investment. After half an hour, the Saudi index was down 3.0 percent, partly reversing its 4.1 percent rebound Monday....