LOS ANGELES (AP) — Federal authorities say a Washington man provided chemicals to make explosives that were used to bomb a California fertility clinic in May. Authorities arrested 32-year-old Daniel Park on Tuesday night in New York upon his return from Poland. U.S. Attorney Bill Essayli say Park shipped 180 pounds of ammonium nitrate to Guy Edward Bartkus, who bombed the clinic. The chemical compound is an explosive precursor that can be used to make homemade bombs, Essayli said. Park also traveled to Southern California in late January to stay with Bartkus for about two weeks, Essayli said. Bartkus was killed in the explosion.