Authorities have evacuated a half-mile (805-metre) area around the chemical spill and the waterway was closed as well.
The US Coast Guard is working with the state Department of Environmental Protection to assess the situation.
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The largest advertising firm in the world and a global law company with offices in London were among the targets.
The Queen, Duke of Edinburgh and other members of the Royal Family have attended the funeral of Countess Mountbatten of Burma.