Nico Rosberg has expressed his shock after a driving event he was involved in left two people in hospital following an accident at the German football team's training camp in northern Italy.

The 28-year-old, who leads the 2014 Formula One drivers' standings after his win in Monaco over the weekend, was participating at a Mercedes event when two people were injured by another car driven by professional touring car driver Pascal Wehrlein.

Two members of the German World Cup squad, Schalke duo Benedikt Howedes and Julian Draxler, were reportedly passengers in Wehrlein and Rosberg's cars respectively but were unhurt.

Rosberg said on Twitter: "I am shocked by the accident. My thoughts are with the two people who were injured and I wish them a fast recovery."

German daily Bild reported that Rosberg slowed his car to avoid hitting a spectator who had walked on to the track, followed by a marshal, and Wehrlein swerved to avoid him but hit the two people, one of whom was air-lifted to hospital shortly before 3pm local time on Tuesday.

A statement on Mercedes-Benz Motorsport's Facebook page said: "An accident occurred during a visit to the training camp of the German National Football Team: while driving on a closed circuit, DTM driver Pascal Wehrlein injured two people whom he unexpectedly encountered walking on the closed course.

"We cannot offer any statement concerning the severity of injuries, as both injured parties are currently undergoing medical treatment.

"Pascal Wehrlein was uninjured in the accident. We deeply regret this accident and send wishes of quick recovery to the injured. We will work in full cooperation with the authorities in determining the exact circumstances of the accident."

Howedes and Draxler trained with the team as normal later in the afternoon.