Intro:

Race leader Alberto Contador is involved in a crash in the Giro d'Italia as André Greipel wins stage six.

Script:

Race leader Alberto Contador was caught up in a crash as German Andre Greipel won stage six of the Giro d'Italia.

Spaniard Contador retained the race lead from Astana's Fabio Aru by two seconds, with Team Sky's Richie Porte 20 seconds back.

But the Tinkoff-Saxo rider didn't wear the pink jersey on the podium after suffering an arm injury and will undergo X-rays to assess the severity.

Lotto's Greipel beat Matteo Pelucchi and Sacha Modolo in a sprint finish.

Contador is attempting to become the first man since Marco Pantani in 1998 to win the Giro and the Tour de France in the same year.

The crash happened in the final 300m of the stage when a spectator leaned over the barriers to take a photograph and clipped rider Daniele Colli with his camera. The Italian fell, bringing down several riders in the peloton.

Friday's seventh stage is the longest of the race, a mainly flat 264km leg from Grosseto to Fiuggi.