(Reuters) -Denmark's Tour de France champion Jonas Vingegaard broke a collarbone and several ribs in a massive crash during stage four in the Tour of the Basque Country on Thursday, which also involved race leader Primoz Roglic and Remco Evenepoel.

The crash happened at high speed on the descent from the Olaeta climb with 35.9-km remaining when one rider went down causing a chain reaction, and Vingegaard was still on the ground receiving medical treatment several minutes later.