Law enforcement memo of "imminent" terror attack?

Sean Bonner blogs, "I have a friend with a job that makes certain Police Department memos things he needs to take note of. This is the one he got this morning. I've known this person for a very long time and I'm vouching for it's authenticity:"

Subject: FW: Terrorist Attack on US Soil is Imminent Importance: High

LAW ENFORCEMENT SENSITIVE

At the meeting of the Southern District of the Anti-Terrorism Advisory Council (ATAC) that was held yesterday in Houston, US Attorney Michael Shelby informed the group that a terrorist attack of 09/11/01 proportions was going to be carried out on US soil within the next 6 weeks.

Mr. Shelby stated that on 09/13/04, US Attorney General John Ashcroft had a conference call with all 93 US Attorneys, an event which is extremely rare. The US Attorneys were informed that without a doubt an attack was going to be perpetrated in the US within the next 6 weeks, prior to the elections. Mr. Shelby urgently requested that all law enforcement be aware of any situation that may be out of the ordinary and report the activity immediately. Mr. Shelby also requested that we get the word out to patrol officers and detectives to talk to their informants and report anything odd or remotely suspicious. Mr. Shelby ended this warning by saying that unless we get a bit of "luck" and the attack can be detected and prevented, that another attack of 9/11 scale will be carried out.

Please disseminate to all of your law enforcement contacts ASAP.

New Mexico Investigative Support Center

Direct Line: 505-541-7000

Fax: 505-541-7006

John E. Vinson, Director

Link to Sean's blog post.

Mike Outmesguine says, "I called the number at the bottom of the email and told them I'd seen this notice, and wanted to find out more about the source of the warning. A representative from the New Mexico ISC told me that they forwarded the notice along after having recieved it from the Southern District Anti-Terror Advisory Council in Houston. They gave me a contact at that organization, whom I phoned, but I only got voicemail. I've also contacted the public affairs department of my local FBI office. My question is if it is a regional notice for TX and NM, or if it's something much bigger and LA and other areas will be advised to go on notice."

And in related news, CNN reports:

A Democratic senator said he will close his Capitol Hill office until after the November 2 election, fearing a possible terrorist attack that could harm his staff or visitors.

Sen. Mark Dayton of Minnesota issued a statement Tuesday, citing a "top-secret intelligence report on our national security" provided to congressional members by Majority Leader Bill Frist, R-Tennessee "Based upon that information," Dayton wrote, "I have decided to close my office in the Russell Senate Office Building until after the upcoming election.

Link

See also this earlier Cryptome post on a September memo warning of terror attacks, with links to earlier news coverage: Link