A 23-year-old Michigan man has admitted to plotting to set off a homemade bomb in the tunnels near the Xcel Energy Center, hoping it would cause a power failure and prompt cancellation of the Republican National Convention.

Matthew B. DePalma of Flint, pleaded guilty in federal court in Minneapolis Tuesday to illegally possessing Molotov cocktails.

According to the plea agreement:

DePalma spent about 90 minutes at the Hennepin County Library on Aug. 18 researching recipes for homemade bombs. He bought the supplies for Molotov cocktails a few days later.

He said that if he could bomb the Xcel Center on Sept. 1, "they might call off the convention." ...