The FIA has reprimanded Nico Rosberg for impeding Sergio Perez during the second Formula 1 free practice session for the Bahrain Grand Prix on Friday.
Perez's Force India swerved violently around Rosberg's Mercedes when the championship leader slowed suddenly early on in the session.
The governing body has given Rosberg his first reprimand of the season for slowing "unnecessarily and recklessly in front of car 11 between Turns 13 and 14", according to an official statement.
Report: Mercedes 1-2 in free practice
Rosberg went on to set the second fastest time of the session, behind team-mate Lewis Hamilton, while Perez outpaced team-mate Nico Hulkenberg to sit inside the top 10.
Sauber's Esteban Gutierrex was also investigated for impeding Felipe Massa's Williams on the same stretch of track, but the stewards decided not to take any action against the Mexican.