SAO PAULO (AP) — Max Verstappen pushed Force India’s Esteban Ocon after the Brazilian Grand Prix on Sunday following a collision on the track when the Red Bull driver was leading the race.

The incident is being investigated by Formula One stewards.

Verstappen finished second in the race, which was won by Mercedes’ Lewis Hamilton.

The collision happened on lap 44 at Interlagos when Verstappen was building a lead over Hamilton and trying to pass backmarker Ocon, who was not moving aside.

Moments after crossing the line second, Verstappen said over the radio to his team: “I hope I can’t find him (Ocon) in the paddock now” and the Dutchman then added a couple of expletives.

Verstappen cut off his post-race interview to confront Ocon in the paddock.

The Frenchman pushed Verstappen’s hand away, but Verstappen appeared to angrily shove Ocon in the chest twice as the Force India driver seemed to beckon to his mechanics for help.

As Ocon grinned and seemed to say something, Verstappen pushed him hard again in the chest and walked off, before turning around and pointing a finger at Ocon.

At a news conference later, Verstappen said he insulted Ocon to his face and said it was fair that the Frenchman received a stop and go penalty after the incident.

Ocon did not apologize in an interview after the incident.

“What really displeases me is his behavior afterward, coming to see me and then violently shoving me,” Ocon told Canal Plus television. “To behave like a lunatic clearly isn’t right and not sporting.”

Red Bull team principal Christian Horner defended Verstappen’s actions, saying that “Ocon has to take responsibility. He’s cost him a grand prix victory today.”