The 37-year-old man, who had boarded Singapore Airlines’ SQ33 flight from San Francisco to Singapore, told cabin-crew members he had a bomb in his carry-on bag. Singapore Police Force (SPF) said they were alerted of the threat at 2:40 a.m. Singapore time.

Fake bomb threats are not uncommon in aviation, and in early July, a British teenager was fined $53,000 for claiming there was an explosive device on board an EasyJet flight from London Gatwick to Menorca in Spain.

As in the Singaporean case, a Spanish fighter jet—an F18 fighter—had to fly closely beside the commercial plane to escort it to safety. After checks were run on board using bomb-disposal experts and sniffer dogs, a device wasn’t detected, and the 18-year-old Briton was arrested.

In this case, the plane had left San Francisco at 10:05 p.m. PDT, or 1:05 p.m. Singapore time, for its 16-hour flight, and the incident was reported some 12 hours after takeoff.

The passenger, who has not been identified by police, was restrained by the crew and then arrested by officers for making false threats of terrorist acts and for suspected consumption of controlled drugs.

The plane landed safely in Changi Airport at 5:51 a.m. Singapore time after being reportedly escorted by two Republic of Singapore Air Force (RSAF) fighter jets. Singapore’s public state broadcaster Channel News Asia wrote that the plane arrived at its destination with no delays.

“Earlier today, two of our F16C/Ds were activated to escort a Singapore Airlines flight that departed San Francisco for Singapore. This was because of a suspected bomb threat on board the aircraft,” the Singapore Air Force said Wednesday. “Our fighters escorted the airliner till it landed safely at Changi Airport.”

In a remote bay at Changi Airport, the plane was searched for a potential bomb, but the man’s claim was found to be a hoax. According to Singapore’s Defense Ministry, “teams from [the army’s] Chemical, Biological, Radiological and Explosives Defence Group and Airport Police Division were on site to verify the claims.”

The passengers and crew were allowed to disembark only after all checks had been conducted. SIA issued an apology to customers “affected and inconvenienced” by the fake bomb threat, writing in a statement that the company is “assisting the authorities with their investigations and regrets that we are unable to provide further details.”

According to the Defense Ministry, investigations into the incidents are “now ongoing.” It’s not yet known what kind of penalty the man who made the threat on the SIA plane will face.