Authorities have not uncovered any stowaways after an extensive search of a cargo ship docked in Newark.

Lt. Fannie Wilks, a spokeswoman with the U.S. Coast Guard's New York command center tells the Star Ledger the search ended at 10:00PM Wednesday night.

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"Typically, if there's evidence on board, we will find a stowaway. This time we didn't," Wilks said.

The Homeland Security Department says officials examined 160 out of 2,000 containers. Crews from the Ville D'Aquarius will reseal all the searched containers and continue onto Norfolk, Virginia at 12noon on Friday.

The search began Wednesday after a Coast Guard inspection team heard knocking for about two hours.

The Department of Homeland Security said Thursday that a search triggered by a reported knocking sound had ended with no stowaways found. The agency refused to answer questions about what may have caused the false alarm.

Federal authorities used X-ray machines and dogs in their search of the 850-foot ship in Newark, one of the nation's busiest ports.

The 850-foot ship began its voyage May 30 in the United Arab Emirates. It made one stop in Pakistan and two stops in India.

Its last port before Newark was in Egypt on June 15.

The Associated Press contributed to this story.