One of the multiple murky aspects of the U.S. Education Department’s apparent involvement in the D.C. cheating probe is how it began. Was the agency’s office of inspector general asked by the District’s IG to assist? Did it intervene on its own? Was it prodded by Education Secretary Arne Duncan, who has been more vocal lately on the issue of test security?

Justin Hamilton, Duncan’s press secretary, offered a fragment of new detail today.

“All I can say for now is that we’ve met with the IG’s office about the issue of cheating and know that they are engaged and paying close attention to what’s going on,” he said.

More fragments as they develop.