Fears of a hijacking at Amsterdam Airport Schiphol briefly brought one of Europe's busiest airports to a standstill on Wednesday - before it emerged that an alarm had been activated by mistake.
A so-called GRIP 3 was also declared, which typically means that an incident could affect a large group of people.
Dutch Prime Minister Mark Rutte told a meeting of his VVD party he may be called away because of the situation at Schiphol, according to the UK's Guardian. Emergency services are on the road or already on site for a "suspicious situation on board an aircraft".
Security lock down at #schipol anyone knows what's going on at #ams #AmsterdamAirport?
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Military police said the incident involves a "suspicious situation" on board a plane.
The authorities said they were investigating a situation on a plane. "We keep you posted", the airport said on social media. Air Europa flight 1094 was set to depart at 7:10 p.m., but was still on the ground at 8:40 p.m. with an unexplained delay, according to the airline's website.
However, passengers at the airport are reported a state of lockdown, and a heavy armed response presence. Flights are still landing at other parts of the airport.
'Passengers and crew are safely off the plane, ' the Royal Military Police, which deals with ports and airports, said on Twitter without giving further details.