LONDON—More than 100 flights at one of Europe’s busiest airports were grounded Thursday by drone operations that authorities say were a deliberate attempt to disrupt travel.

Police and military forces were involved in the response, Britain’s aviation minister Liz Sugg said. Sussex police said the drones were of an “industrial specification,” rather than a toy or amateur unmanned aircraft.

The incident, at Gatwick Airport—Britain’s busiest after London’s Heathrow—amplifies concerns about the threat to commercial flights from unmanned aircraft.

The drone flights near the airport began late Wednesday and continued into Thursday, the airport operator said. Some flights, including to the U.S., were grounded and others diverted to land at other airports, stranding, diverting or delaying tens of thousands of passengers in the run-up to the busy holiday travel period.

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This is an excerpt from The Wall Street Journal.

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