You’ve no doubt read about the reported detection of anthrax in two Pentagon mailrooms yesterday.

There’s lots of activity going on in D.C. this morning and conflicting/unconfirmed info:

As testing continued Tuesday, President Bush was being regularly updated on the situation, White House press secretary Scott McClellan said.

“The initial testing came back positive. There was some additional testing that was done and it was inconclusive,” he said. “We’re still waiting on more definitive results.”

The two pieces of mail, the origins of which were not provided, had been irradiated, so officials believed any anthrax in them was inert when they triggered alarms at the two mail facilities on Monday…There were no initial reports of illness.

In breaking news, WTOP reports that hazmat crews have now been sent to IRS offices :

Hazardous materials crews are checking out a report of a powdery substance found in a letter at the IRS building downtown.

D.C. Fire and EMS spokesman Alan Etter says a hazardous materials team is on the scene at 12th and Constitution, NW.

The letter was found Monday on the 7th floor, Etter tells WTOP. It has been since taken in a plastic bag to the building’s loading dock.

“Hazmat is inside right now. We’re taking readings to try and find out what this material is — whether this is a hoax or the real thing,” Etter says.

Andrew Cochran at Counterrorism Blog notes that D.C. Mayor Anthony Williams disclosed at a press conference this morning that a Washington Postal Service facility is also being tested.

More from WTOP: Workers at the postal facility on V Street in D.C. are being given antibiotics as a precaution.

Maybe something. Maybe nothing. But it’s all a reminder that the original anthrax attacks, which killed five and affected dozens of other largely forgotten victims, remain unsolved.

Update, 3/16: Tests Negative.

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My tribute to one of the 2001 anthrax victims, “Little Joe” Curseen.