A federal jury in Kansas City, Kan., on Monday found a Lawrence man guilty on two counts of using a cell phone in making threats to blow up a school building.

Michael E. Parker, 46, will be sentenced by Judge Kathryn Vratil on Dec. 17. He faces a maximum of 10 years in prison and a fine of up to $10,000 on each count.

In a trial that began a week ago, federal authorities said Parker used a cell phone to call 911 and make the threats on the morning of April 19. Nine suspicious calls were made between 5:15 a.m. and 8:09 a.m., some with a voice threatening schools and mentioning a pipe bomb. No specific school was named as a target.

Police worked with Sprint in determining the calls came from the area of 12th and New York streets, where Parker was staying in an apartment. After obtaining a search warrant, the cell phone used in the threats was found in the apartment. A female acquaintance of Parker’s had identified his voice on the 911 tapes, Assistant U.S. Attorney David Smith said.

Parker’s attorney, Jeffrey Morris, argued that several people had been in the apartment through the night, many of them doing drugs. He said there wasn’t enough evidence to tie the calls to Parker.

The calls caused Lawrence schools to take extra security precautions and thousands of students returned home. The threats came three days after the massacre on the Virginia Tech campus.