After being called to a from three states Tuesday, the top law enforcement officer of another state issued an ultimatum to the online classified ads house: pull graphic pornographic material and prostitution ads from the site or face prosecution.

South Carolina Attorney General Henry to Jim Buckmaster, CEO of , saying the Web site has not installed sufficient safeguards to keep the site from being used as a "vehicle to advertise or solicit prostitution." McMaster added that he's concerned about the easy accessibility of "graphic pornographic pictures" on the site.

"Many of the classified and communication services on the Craigslist site provide the public with a valuable service," wrote McMaster. "However, 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 40 state attorneys general."

The attorney general then added that he wants the questionable ads under Craigslist's Erotic Services category to be removed from the South Carolina part of the site by close of business on Friday, May 15.

In a blog posted on Tuesday, has been working with law enforcement officials and have cut site "misuse" by 90% since Craigslist entered into an agreement with 43 attorneys general late last year to do just that.