Helicopter crash off coast of Hawaii
Rebecca Forand | For NJ.com By Rebecca Forand
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on January 17, 2016 at 3:55 PM, updated January 17, 2016 at 3:56 PM

A handout photo provided by the US Navy on 15 January 2016 shows marines assigned to the 11th Marine Expeditionary Unit conducting insertion exercises from a CH-53E Super Stallion helicopter into a combat rubber raiding craft, in the Arabian Sea on 19 January 2012. The US Marine Corps has confirmed on 15 January 2016 that two CH-53E helicopters have collided off the coast of Hawaii. A search and rescue mission is underway, with up to 12 Marines reported missing at sea. EPA/Petty Officer 2nd Class Alan Gragg / HANDOUT (Petty Officer 2nd Class Alan Gra)

HONOLULU — Two Pennsylvania men, including one from Philadelphia, are among 12 Marines who are missing in Hawaii after two helicopters crashed off of Oahu Thursday, 6ABC reports.

The two heavy-lift helicopters did not return to their Kaneohoe Bay base after a training mission that night and a Coasr Guard helicopter and airplane spotted debris a few miles off the shore a few hours later. On board were four officers and eight enlisted men, the Marine Corps Times reports, and it is unknown if the two helicopters collided or something else caused them to go down in the sea.

Capt. Brian T. Kennedy, 31, of Philadelphia, as well  as 25-year-old Sgt. Adam C. Schoeller of Gardners, Pennsylvania were among those onboard.