Recently we've had some riders report that the bolts on the rear fender of their VanMoof S3 or X3 bike came loose in use. Upon further analysis we’ve ascertained that these incidents are linked to an early batch of bikes – where it appears that on some bikes, the rear fender bolts were not tight enough. This does not exist on later batches of bikes. Our initial analysis did not show that loose fender bolts could cause a safety risk to our riders. We are however now investigating what caused a serious accident involving a VanMoof S3. We have not determined what caused that accident to occur, but while we conduct that investigation we want to take further precautionary measures now on all 1.631 bikes from the early batch.