WICHITA, Kan. (AP) -- A central Kansas man has pleaded guilty to using a 9-year-old girl to produce child pornography after an investigation that began earlier this year in Australia.

The U.S. Attorney's office says 50-year-old Philip Grigsby, of Marquette, pleaded guilty Thursday to eight counts of sexual exploitation of a child. He also pleaded guilty to one count each of possessing child porn and unlawful possession of a firearm as a felon.

An Australian investigation led to Grigsby after child pornography found on an Australian man's computer was traced back to Kansas.

Prosecutors say more than 400 images and five movies showing the exploitation of a minor victim were found on Grigsby's computer.

Grigsby will be sentenced Feb. 4. He could get up to 30 years on each exploitation charge.