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An employee checks crude oil processing equipment at the Shengli Oil Field in Dongying, Shandong province. [Photo by Hu Qingming / For China Dai]

An armed school resource officer had also been on the Stoneman Douglas campus, and was criticized for failing to stop the gunman, who had an AR-15 assault-style rifle. The officer, who resigned, said he had not been sure where the gunfire was coming from.

An employee speaks with a customer at the Tesla showroom in Newport Beach, California, the United States. Tesla reached a milestone critical to Elon Musk's goal to bring electric cars to the masses - and earn some profit in the process - by finally exceeding a long-sought production target with the Model 3. [Photo/Agencies]

An environmental threat is also posed by human waste as low-lying municipal sewage plants flood. On Sunday, the Cape Fear Public Utility Authority reported that more than 5 million gallons of partially treated sewage had spilled into the Cape Fear River after power failed at its treatment plant.

Amtrak serves more than 500 destinations in 46 U.S. states and three Canadian provinces with more than 300 trains running over 21,300 miles (34,000 km) of track every day.