Diplomats say the United States is leading an effort to create a way to attribute blame for chlorine attacks in Syria.

The U.N. Security Council has been unable to follow up on a resolution it passed earlier this year that condemned such attacks in Syria and threatened action for further violations because no one has had a mandate to assign blame.

A council diplomat on Wednesday said the proposed new mechanism likely would answer to the council and would allow experts access to look into attacks. The diplomat spoke on condition of anonymity because the diplomat wasn't authorized to speak publicly about the draft.

The U.S. did not immediately comment Wednesday. A U.S. official on Tuesday said, "We are actively engaged in conversations with U.N. colleagues" on the chlorine issue.