What is the recommended immediate action if you detect a gas leak during a setup?

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Gas leaks create a serious explosion and fire hazard, so the foremost action is to halt any ignition sources and protect people. Stop ignition attempts and evacuate the area to remove everyone from danger. If it can be done safely, isolate the gas source (for example, close valves) to cut off the fuel supply. Ventilate the space to disperse any accumulated gas, reducing the chance of ignition. Then notify the supervisor or fire department so trained responders can manage the situation. Continuing testing would keep risking ignition, and attempting to seal a leak with tape is unsafe and ineffective—gas leaks require professional intervention and proper repair.