West Yorkshire Police have issued a warning to cyclists to be vigilant after drawing pins were found scattered on a route used by bike commuters in Leeds.

An officer who patrols the north east of the city revealed on Twitter that he stopped to help a female cyclist who had punctured on the Meanwood Valley cycle path this morning – and subsequently realised that he, too, had picked up a drawing pin in his own tyre.

He subsequently added that a friend had picked up four drawing pins at the same location this morning.

Leeds Cycling campaign also tweeted about the drawing pins, saying that one of its members had picked up no fewer than 150 of them.