MEXICO CITY (AP) — A U.S. senator is urging an investigation into whether two guns recovered at the scene of a shootout in Mexico that killed a beauty queen were part of the U.S. gun-smuggling operation known as “Fast and Furious.”

Sen. Charles Grassley, a Republican from Iowa, said in a statement that he received tracing information on a semi-automatic pistol and an AK-47 assault rifle recovered in Mexico’s Sinaloa state at the scene of a Nov. 24 shootout that killed at least three people, including 20-year-old beauty queen Maria Susana Flores Gamez.