Jonathan Sunderman / US Navy via Reuters

Guided-missile destroyer USS Porter (DDG 78) is seen after a collision with the bulk oil tanker M/V Otowasan in the Strait of Hormuz, Aug. 12. No one was hurt and shipping traffic in the waterway, through which 40 percent of the world's seaborne oil exports pass, was not affected, officials said.

The collision nevertheless left a gaping hole in the starboard side of USS Porter, a guided-missile destroyer, but no one was injured on either vessel, the U.S. Navy said in a statement. The collision with the Panamanian-flagged bulk oil tanker M/V Otowasan occurred at approximately 1 a.m. local time. 

The cause of the incident is under investigation, the Navy said, adding that there were no reports of spills or leakages from either the USS Porter or the Otowasan. 

Reported by NBC News wire services

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Jonathan Sunderman / US Navy via Reuters