An anonymous call from a concerned citizen led Glendale Fire Marshals and Glendale Police to hundreds of illegal fireworks.

The seizure took place July 1 near 67th Avenue and Cactus Road in Glendale. A citizen alerted officials to what they believed was an illegal sales operation inside a local business.

The caller reported lines of people outside the store waiting to purchase the fireworks. When Glendale police and fire inspectors arrived on the scene they found hundreds of illegal fireworks, each housing 500 grams of explosive materials, Glendale Fire reports. All of those seized during the operation were prohibited for use or sale within the City of Glendale.

It is unclear how many fireworks were purchased prior to the seizure.

Fire personnel say had the explosives caught fire the injuries to employees and the damage to adjacent business could have been catastrophic. The Glendale Police Department is working with the City Prosecutor’s Office to determine if charges will be filed.

Every year, thousands of people are rushed to emergency rooms across the country due to injuries they sustain from fireworks, the fire department cautions. The most common injury is from burns, quickly followed by blast injuries to the hands, fingers and the face.

Fire officials urge people who did purchase these fireworks not to use them. The risk of brush and structure fire is extremely high with the region’s current weather conditions.