Jared Lee Loughner, the suspected gunman in a shooting rampage at a Safeway supermarket in Arizona that left six dead and 14 wounded, including Rep. Gabrielle Giffords, reportedly planned the shooting in advance.

Authorities executed a search warrant at Loughner’s home and found a letter inside a safe that Rep. Gabrielle Giffords wrote to Loughner on Aug 30, 2007, thanking him for attending a “Congress on Your Corner” event, according to an FBI agent affidavit filed with a five-count criminal complaint.

“Also recovered in the safe was an envelope with handwriting on the envelope stating “I planned ahead” and “My assassination” and the name “Giffords,” along with what appears to be LOUGHNER’s signature,” the criminal complaint reads.

Click here to read criminal complaint against Jared Lee Loughner.

Federal charges have been filed against Loughner, who fired the shots during a political event.

The criminal complaint includes an attempt to kill a member of Congress, two counts of murder in the first degree and two counts of attempted murder.

This comes as authorities announced that the man previously thought to be associated with the suspect has been cleared of any involvement in Rep. Gabrielle Giffords shooting.

Fox News has confirmed that the white man in his 40s or 50s who was photographed by a security camera arriving at the “Congress on Your Corner” event at the same time as the suspect was eliminated as a person of interest.

FBI Director Robert Mueller said earlier on Sunday that Loughner, 22, may face additional charges under the domestic terrorism statute.

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