The U.S. military is preparing a bulk transfer of 10 detainees on Thursday from its detention center at Guantanamo Bay, Cuba, two defense officials told Fox News.

The transfer, amounting to about 10 percent of the remaining prisoners, marks the largest group of detainees to be shipped out of the camp since Defense Secretary Ash Carter informed Congress in December his department would transfer a wave of detainees at the beginning of 2016.

The accelerated transfers reflect a renewed effort by the president — who is likely to highlight the issue in the State of the Union address Tuesday night — to shutter the controversial prison camp. But the moves have heightened security concerns, as some of the latest detainees being shipped out were deemed medium — or high-risk prisoners.

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