Schoolchildren in the vicinity are being allowed to leave schools to go home, according to local broadcaster WCAU.
The road leading to the town of Paulsboro has been reopened but a limited evacuation is still in force.
The Coast Guard told WCAU that there is no immediate threat.
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Gerry Adams has told UTV the “time is right” for him to step aside as president of Sinn Féin, after announcing that he would do so in 2018.