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Smoke poured into Metro subway tunnels again last night, a day after an unprecedented and unexplained series of such incidents, and baffled officials began to consider the possibility that the events were more than mere accidents.
"This is not normal," ... "This is highly, highly irregular."
At one point, a Metro spokeswoman said, seven trains lost power in the Blue and Yellow Line tunnels south of the Pentagon.
"We're at a loss to identify the root cause of the problem,"