Former Detroit Mayor Kwame Kilpatrick has admitted to receiving another $4,000 in wire transfers not previously disclosed, a state corrections spokesman tells Robert Snell of The Detroit News.

Michigan prison officials are demanding that Kilpatrick identify who gave him the money, which Kilpatrick told investigators about on Thursday, said spokesman Russ Marlan.

State officials began their probe after the revelation two days earlier that a Chicago pastor wired Kilpatrick $2,000 in December. That prompted Michigan officials to slap an electronic tether on Kilpatrick on Thursday and order him confined to his mother's Detroit home. He's also banned from traveling to Texas, where his family now lives.

The terms of Kilpatrick's probation from a 2008 guilty plea to two obstruction of justice charges in a text-messaging scandal include disclosing all income and paying $1 million in restitution installments to Detroit. 

Read more: Detroit News