Sergio Perez has criticised Kevin Magnussen after the pair came perilously close to a collision in Belgian Grand Prix practice.
It was a clumsy incident, with Perez attempting to repass the Dane on the run towards Pouhon shortly after letting him through.
Magnussen started weaving and blocked Perez, who slammed his “dirty” rival over team radio.
The Mexican complained to FIA Race Director Charlie Whiting in the drivers’ briefing, claiming Magnussen could have caused an accident.
Asked by Autosport if he felt the manoeuvre was deliberate, he replied: “Yes, he knew I was there because he had just overtaken me.
“I don’t know what he was angry about but I just don’t think it’s the way to react.
“We’ve seen Kevin has reacted that way a couple of times already.
“It’s not good, at the speeds we are doing you can cause a very bad incident.
“That’s why I wanted to raise a point. Hopefully Charlie keeps it in his mind because tomorrow there could be an accident and it may be too late.”
Magnussen, though, was adamant that it was not intentional.
“I didn’t know he was trying to get back again, as he’d just let me past,” he said.
“So I started warming up my tyres and he was close, but I hadn’t seen him. It was not intentional.”
The 24-year old became embroiled in a bitter war of words with Nico Hulkenberg last time out in Hungary after aggressively defending his position.