The Economic and Financial Crimes Commission has detained the immediate past Chief of the Air Staff, Air Marshal Adesola Amosu.
Amosu was detained as he honored EFCC invitation on Wednesday.
A senior operative with the commission told Vanguard that Amosu had been helping the agency in the investigation into the procurement of arms for the armed forces between 2007 and 2015.
The NAF under Amosu is alleged to have admitted receiving non-existent ammunition and aircraft, a development which a presidential panel frowned at.
A source in EFCC confirmed that Amosu was invited on Wednesday over the amount which was allegedly used under his leadership for arms procurement worth N29 billion.
He is said to have made a statement under caution to the EFCC operatives but was not allowed to go home, an indication that they were not satisfied with his statement.
President Muhammadu Buhari ordered the probe of arms procurement and the panel has returned a damning verdict indicting top military and political actors who are being tried in court.
Many other top military officers named in the arms scam have had their property sealed as a first step towards confiscating them.