Some bits to speculate about
Here's some more information gathered from press reports: AB2450 (a 737-800) was scheduled to take off from Dortmund for Las Palmas at 7:05 this morning. 165 pax and 6 crew on board (as well as a dog in cargo, as one report says).
Citing airport officials, reports say that the pilot aborted take-off due to "technical irregularities". Aircraft "skidded" off the runway and came to stop nose-down on an adjacent field. According to one report, the aircraft, while trying to brake, veered off the side of the icy safety area.
All pax and crew (as well as the dog) are unharmed and left the aircraft via stairs.
Reports cite an Air Berlin spokeswoman saying that the pilot had to abort take-off because of two differing speed readings from cockpit instruments. There seems to have been a problem with the aircraft's speed indicators.
According to an news agency report, the airline asked whether the safety area had been properly de-iced.
Aircraft not damaged, says the airline. Dortmund airport closed until aircraft is recovered. Pax continue journey via Paderborn.