Officials still have not determined what caused an oil slick in Sandy Hook Bay.

A Coast Guard crew confirmed a 2-mile-long, 300-foot-wide light sheen on the water on Thursday afternoon.

A boom was deployed to shield Horse Shoe Cove.

State and federal responders were unable to relocate the sheen on Thursday evening.

Officials are concerned that the spill could impact wildlife that inhabit the bay, including seals that migrate to the area each winter.

Newsday's Gregg Sarra hosts a new show covering the latest in high school sports on Long Island.  Credit: Newsday/Mario Gonzalez

SARRA SOUNDS OFF: Dunia's comeback, Wyandanch hoops, more Newsday's Gregg Sarra hosts a new show covering the latest in high school sports on Long Island. 

Newsday's Gregg Sarra hosts a new show covering the latest in high school sports on Long Island.  Credit: Newsday/Mario Gonzalez

SARRA SOUNDS OFF: Dunia's comeback, Wyandanch hoops, more Newsday's Gregg Sarra hosts a new show covering the latest in high school sports on Long Island. 

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