Dirar Abu Sisi, an engineer at Gaza’s power plant, disappeared last month en route to Kiev and mysteriously resurfaced in an Israeli prison.

The Gaza-based Palestinian Center for Human Rights says one of its lawyers was permitted to visit him Sunday. He told the group he was denied access to a lawyer for 25 days.

The group says he told the attorney he was forcibly removed from his train compartment and brought handcuffed and hooded to an apartment. He said at least six Israeli agents interrogated him before flying him to Israel.

Israel confirmed Sunday it was holding Abu Sisi, but offered no other details.