An unidentified passenger allegedly set up a fake Wi-Fi network aboard a Delta flight from Las Vegas to Atlanta, United States on Monday, prompting the pilots to alert air traffic control, according to the airline and public radio communications from the aircraft.

“[The] safety of flight was never in question and no aircraft operating systems were affected,” Delta spokesperson Morgan Durrant told TechCrunch.

“We are fully investigating to gather a complete set of facts, which will take time. We will partner with federal law enforcement and aviation regulators to ensure the incident is thoroughly investigated,” the spokesperson stated.

The flight crew switched off the aircraft’s legitimate Wi-Fi service for about 30 minutes following the incident.

After discovering the rogue network, the pilots sent two messages to air traffic control during the flight, reporting that a passenger had “created a scam Wi-Fi” intended to mimic the aircraft’s legitimate wireless network.

The pilots said they had no further information about the incident but noted that some passengers had attended cybersecurity conferences in Las Vegas the previous week.

It remains unclear what the passenger or passengers were attempting to do. Creating a fake or malicious Wi-Fi network can be relatively easy with commercially available tools such as the Wi-Fi Pineapple, a device designed to spoof legitimate networks. Such devices are marketed to professional security testers for auditing corporate networks as well as hobbyists learning about cybersecurity.

The Atlanta Police Department referred questions about the incident to federal authorities. Federal Aviation Administration spokesperson Steve Kulm said the agency had not received a report of the incident.

The FBI said it was aware of the matter and was working with local and corporate partners to investigate.