The Fresno police department made Susan B. Anthony Elementary School their own personal shooting range on Monday night.

The police department distributed flyers warning residents of the “field training” earlier in the week, but people we talked to weren’t aware of what was going on in the school grounds across from their homes.

Here’s a statement from FPD:

The Fresno Police Department will be installing gunshot detection technology in the Southwest and Southeast Policing Districts. Before the system can go “live,” the technology must be calibrated. This will occur on Monday, June 29, 2015 from 8 p.m. until 11:30 p.m.

To calibrate the system, the Fresno Police Department will be conducting test firing of different caliber weapons at each location. During the calibration, the weapons will be test fired multiple times to create acoustic patterns. The calibration will take place at various locations in the Southwest and Southeast Policing Districts at 9:00 pm, 10:00 pm, and 11:00 pm.

Every safety precaution has been taken to ensure the calibration is done safely. Prior to each test being conducted an announcement will be made on Fresno Police radio communication channels 1 and 2.

Neighborhoods have been posted with flyers announcing that FPD will be conducting training exercises in the specific neighborhoods. In addition, the communications center, each of the policing districts, and staff have been notified of the test date and time.

Watch the VIDEO: