A massive amount of reward money offered for information in the deadly mass shooting in Birmingham’s Five Points South is pulling in dozens of tips. Since the $100,000 reward was announced Monday, Crime Stoppers of Metro Alabama has received close to 50 tips.

The shooting, which left four dead and 17 injured, is just the latest spurt of mass violence made possible by the small 3D-printed part known as a “conversion device,” “Glock switch” or “auto sear.”

A search is underway for the shooters who killed four people and injured 17 others in a weekend shooting at a popular nightspot in Birmingham, Alabama.