Fernando Alonso and Max Verstappen were both left furious with Lewis Hamilton during FP2 for the Emilia Romagna Grand Prix.
Verstappen cut a frustrated figure in the car on Friday as Red Bull struggled to get it together on track in both practice sessions.
The three-time world champion complained about a lack of grip on several occasions as he ended up fifth and seventh respectively in both sessions.
"My God. I don't know man. It's so difficult everything man," he moaned on team radio during FP2.
Lewis Hamilton apologised to Max Verstappen
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"This time suddenly the front grips up a lot, I almost spin.
His anger boiled over at one moment during FP2 when he was held up by a slow Hamilton.
Verstappen was seen making a furious gesture in his car in the direction of Hamilton, who appeared to accept responsibility by holding his hands up.
The incident came just a few minutes after Alonso accused Hamilton of not being fully aware of his surroundings.
The Spaniard was on a flying lap and cutting through the first sector when he made his way through to Turn 7, where he met a slowing Hamilton.
The Mercedes driver was on an outlap and failed to move out the way of Alonso, who was forced to abort his hot lap.
He complained: "Hamilton thinks that he is alone on the track.
"It's the second lap he does it. Turn 12 and now Turn Seven."
While it was an off day for Red Bull in both practice sessions, Ferrari enjoyed a strong start to their weekend following their big upgrade.
Fernando Alonso was also furious with Lewis Hamilton
PA
Charles Leclerc was fastest in both sessions, finishing ahead of Oscar Piastri and Yuki Tsunoda in FP2.
Hamilton was also able to put in faster laps than Red Bull as he took fourth fastest in FP2, just ahead of George Russell.
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Max Verstappen cut a frustrated figure throughout the day
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Verstappen has dominated the start of the 2024 season with four wins from the opening six races.
He sits 33 points ahead of Red Bull team-mate Sergio Perez in the standings, but Leclerc is close by after a handful of steady displays.
Lando Norris will also be hoping to build on the first win of his F1 career last time out in Miami.
