Ma'an Arabic reports that Hamas leader Salah Bardawil said that the "Palestinian resistance" carried out the kidnapping.
Hamas is an acronym for the Islamic Resistance Movement, so he may have been referring to Hamas directly although obliquely. While this is not quite an admission, it is close.
He added, "We are able to ignite a third intifada and no one can cancel this right, which will explode when the pressure increases on the Palestinian people."
Of course, Hamas is both part of and separate from the "unity" government, depending on who is asking.
(h/t Ibn Boutros)