The Pentagon has a secret database that indicates the U.S. military may be collecting information on Americans who oppose the Iraq war and may be also monitoring peace demonstrations, NBC reported on Tuesday.

The database, obtained by the network, lists 1,500 "suspicious incidents" across the United States over a 10-month period and includes four dozen anti-war meetings or protests, some aimed at military recruiting, NBC's Nightly News
said.

The network said the document was the first inside look at how the Pentagon has stepped up intelligence collection in the United States since the September 11, 2001, attacks.

The report quoted what it said was a secret briefing document as concluding: "We have noted increased communication between protest groups using the Internet," but not a "significant connection" between incidents.