An aircraft almost hit a ride-on lawnmower as it landed at Dublin airport last May, according to a report issued on Wednesday.
"I could have sworn I saw a man riding a lawn mower", the co-pilot of the Boeing 757 is reported to have said during the night touchdown.
The captain immediately reported the sighting to air traffic control, where a controller said: "I don’t believe it. They told me they were clear of the runway".
The groundskeeper on the machine moved off the runway seconds after the aircraft passed him.
The plane was carrying 198 passengers on a flight from Egypt.
An air investigation report issued Wednesday said the incident could have had catastrophic consequences.
It said pilots had reported that runway lights were being obstructed by tall grass, which had not been cut because of bad weather.
It was decided that mowing needed to be done as a matter of priority and night cutting was being undertaken during flight operations.