(CNN) -- The top part of a burning television tower collapsed in the Netherlands, leaving a trail of thick billowing smoke and fiery flames. It was unclear what caused the fiery collapse in Hoogersmilde Friday. The incident disrupted television, radio and mobile phone networks nearby. Fire crews arrived before the collapse, but moved to a safe distance when they realized they could not extinguish the blaze, Mayor Jan Broerjes said Friday. No one was injured. An investigation is under way. CNN's Ben Brumfield contributed to this report .
The cause of the fiery collapse in Hoogersmilde is unclear . Incident disrupts television, radio and mobile networks nearby .