The blasts, which occurred while President Vladimir V. Putin of Russia was in the city, also wounded at least 50, officials said.
Pictures also emerged online of a mangled train car and a smoke-filled station.
Blasts were reported at subway stations while President Vladimir V. Putin of Russia was in the city for a meeting and a speech.
Traffic appeared light Monday morning as the first full workweek opened since the fiery collapse of a major Atlanta interstate bridge, complicating the city's already challenging commute
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Colombian officials said 20 tons of supplies arrived on Sunday.
Monday: Wrangling over state funding, shutting down Rikers Island, and making the first private cellphone call.
Leftist candidate Lenin Moreno appeared on the verge of victory in Ecuador's presidential election but his opposition rival refused to recognize the results, calling on his supporters to take to the streets to guard against "fraud."
He was invited by the Chairman of the Joint Chiefs, the official said.
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A win for Mr. Moreno, a former vice president and close ally of departing President Rafael Correa, would be a rare victory for the Latin American left.
Result a setback to a recent right-ward surge in Latin American politics.
The purpose of the trip by Mr. Kushner, the son-in-law of President Trump, was unclear, though it came amid the fight to wrest Mosul from the Islamic State.
There are 1,800 people on the ground working to help.
As cash has flooded Washington from a variety of groups, even the anti-establishment activists and operatives who sided with President Trump have been enriched.