OSCEOLA, Neb. (AP) — A 63-year-old David City man has made a deal with prosecutors and been convicted of seven counts stemming from a pipe bomb explosion that seriously injured a teenage relative on Independence Day last year.

Russell Hilger pleaded no contest to attempted felony assault, misdemeanor reckless assault and five counts of criminal mischief. He made the pleas last week in Polk County District Court, after prosecutors lowered the felony assault charge. Sentencing is scheduled for Sept. 3.

Prosecutors say Hilger stuffed a 2-foot-long steel pipe with gunpowder and towels and lit what was meant to be an enormous firecracker at a family gathering at Ernst Lake. The blast sprayed shrapnel that tore into the abdomen of 14-year-old Lauren Campbell.

Hilger is her great-uncle.