The New York City fire department has released footage of its fire crews working on the building that collapsed after a gas explosion in the city today, killing at least three people and injuring dozens more.
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As North Korea's main trading partner, China's cooperation is critical to any efforts to derail Pyongyang's development of nuclear weapons.
Union boss says he "deeply regrets" the disruption to people's travel plans after several days of talks failed to break the deadlock.
Thousands of people downstream of a dam have been evacuated, but authorities are unable to reach many on the hurricane-hit island.