The South Carolina attorney general gave the management of the Web site Craigslist 10 days to remove postings that he said are pornographic or that encourage prostitution, or face a possible criminal investigation.

“It appears that the management of Craigslist has knowingly allowed the site to be used for illegal and unlawful activity after warnings from law enforcement officials and after an agreement with forty state attorneys general,” South Carolina Attorney General Henry McMaster wrote today in a letter to Craigslist CEO Jim Buckmaster.

McMaster was referring to a November agreement with 40 attorneys general in which Craigslist said it would take a number of steps to combat online prostitution, including charging people who post ads in the “erotic services” section $5 to $10 and requiring them to submit a working phone number to use the site. The information can be used by law enforcement to investigate suspected illegal activity.