he U.S. Department of Homeland Security tracked an anti-war group's plans for peaceful protests and passed the information on to the Maryland State Police, according to documents released to The Washington Post and reported in Tuesday's editions.

The documents are the first indication that the state police had federal partners during their widely condemned spying on activist groups, which went on in 2005 and 2006. The revelation has alarmed Maryland's U.S. senators, who are asking DHS for more details about how it obtained the information it shared.

State police have apologized for spying on peaceful activists and for classifying 53 people as terrorists in an internal database. Police have said the names were not put on federal anti-terrorism lists.

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