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Capitol police, the FBI and the Postal Service are investigating suspicious letters that arrived Thursday at the Washington offices of several House lawmakers.

Sources here on Capitol Hill told me they believe the letters might be targeted at members of the Intelligence and Armed Services Committees.

The letters are said to include a photo of the Times Square military recruiting office before it was bombed early this morning.

The greeting card style photo showed a man standing in front of the recruiting station, with a message below—“Happy New Year, we did it!”

A political manifesto complaining about the Iraq war was also included in the packet.

All of the letters passed through Congressional mail security before arriving at the offices so they’re thought to be safe.

Staffers in the DC offices of our local lawmakers Congressman Phil English and Congressman John Peterson told me they don’t think they’ve received the letter.