German Chancellor Angela Merkel's government aircraft made an emergency landing on the way to the G20 summit, forcing the leader to board a commercial flight to finish the journey.
After landing at Cologne, the reporters were told they would switch to a substitute plane. Last year, Merkel was delayed on a trip to Egypt because a windshield heater malfunctioned.
Merkel was told of the need to turn around Thursday night while she was holding a background briefing for journalists accompanying her to Buenos Aires.
Video from on board shows several fire engines surrounding the Airbus after it landed.
The plane was met on the tarmac by emergency vehicles.
Defence Minister Ursula von der Leyen was informed about the incident immediately, and tried for hours to organise an alternate aircraft to carry Merkel and her entourage.
According to German military blog Augengeradeaus.net, the aircraft was transmitting a 7600 transponder code, indicating a radio failure.
Merkel will now travel to the G20 with a vastly slimmed-down delegation. It further added that Merkel was still waiting for a replacement plane to take her to Buenos Aires for the G20 summit.
Merkel has had to reschedule some meetings due to the delay.
The German air force on Friday ruled out sabotage, with a spokesman telling national news agency DPA that "there is absolutely no indication of a criminal act".