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PORTLAND -- Federal prosecutors say warrantless overseas wiretaps helped make their case against a young Somali-American man convicted of plotting to bomb a 2010 Christmas tree-lighting ceremony in Pioneer Square, according to a report in the Oregonian.

The government made the revelation for the first time in a two-page document filed Tuesday in federal court in Portland, the newspaper reported.

Prosecutors wrote that at Mohamed Mohamud's trial in January they offered evidence that was derived from warrantless surveillance of a foreign target outside the United States, according to the Oregonian.

The information comes less than a month before Mohamud's scheduled Dec. 18 sentencing for attempting to detonate a weapon of mass destruction.

Mohamud was arrested Nov. 26, 2010, after pressing a button on a cellphone that he believed would detonate a 1,800-pound diesel-and-fertilizer bomb near thousands of people at the annual holiday gathering.

The bomb was a fake supplied by undercover FBI agents posing as al-Qaida recruiters.

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