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At a height of 4.53 meters, the roof made access difficult for restoration workers. The tower roof has four layers, with the innermost a wooden core wrapped in a copper skin. The copper was coated with putty and covered with gold foil.

Asked by a reporter if he had told Comey to drop the investigation into former national security adviser Flynn, Trump said, "I didn't say that."

Asked about possible scenarios about the auto industry dispute, Chase foresees that the US administration will issue a report calling for more protectionism on the auto industry, which will create a lot of tension with Europe. But "I don't think that approach will be sustainable in the US," he said.

At midday, the Dow Jones Industrial Average sank 426.83 points, or 1.74 percent, to 24,154.06. The S&P 500 dropped 49.01 points, or 1.78 percent, to 2,705.87. The Nasdaq Composite Index was down 189.11 points, or 2.46 percent to 7,503.70.

At least 46 big-budget semiconductor projects are scheduled to be built in China within two to three years, as part of the nation's broader push to reduce reliance on foreign chip manufacturing and design techniques, according to data compiled from local governments' key 2018 project plans.