A baby sitter arrested in March over the death of a child in his care was served a fresh arrest warrant Monday on suspicion of producing child pornography, investigators said.

Yuji Motte, 26, was initially arrested on March 18 on suspicion of abandoning the body of a 2-year-old boy found dead the previous day in an apartment in Fujimi, Saitama Prefecture, that Motte used as a child-care center.

Investigators said they found several images of naked children, some thought to have been under Motte's care, saved on devices seized from his apartment.