Defense Agency chief Fukushiro Nukaga admitted Thursday that some agency officials removed documents related to a scandal involving its Central Procurement Office before prosecutors raided the agency earlier this month.

"I received a report that some staff at the procurement office took relevant documents home or changed the place where they are kept" before prosecutors raided the office Sept. 3, Nukaga told a House of Councilors panel.

Other senior agency officials also admitted the documents in question were moved before the raid, but said it was still unclear why.