Spa-Francorchamps, Belgium - Red Bull's Daniel Ricciardo won the Belgian Grand Prix on Sunday but Mercedes hogged the headlines after Lewis Hamilton accused championship-leading team-mate Nico Rosberg of deliberately running into him on the second lap.
Hamilton retired with a damaged car but Rosberg, blamed by his bosses and booed by the crowd on the podium, finished second to extend his lead to 29 points with seven of the 19 races remaining.
The victory, on a surprisingly dry afternoon at a circuit famed for rapid changes in conditions, was Ricciardo's second in succession and third of his first season with the reigning Formula One champions.
It was also his team's second in succession in Belgium after four-times world champion Sebastian Vettel triumphed last year and set off a run of nine wins in a row.
Finland's Valtteri Bottas was third for Williams.
“It's been a really good day for us on a track we didn't expect to get maximum points from, so yeah, it'll keep us smiling for a while,” said Ricciardo, who led for much of the race unlike his previous wins.
His endeavours were still almost a sideshow to the major talking point, a further stirring up of already troubled waters at Mercedes.
The two team-mates had been expected to dominate the race after qualifying on the front row but the intense rivalry between them blew up in their face.
“We just had a meeting about it and he basically said he did it on purpose. He said he did it on purpose,” Hamilton told reporters after a post-race meeting with Rosberg and bosses. “He said he could have avoided it. He said 'I did it to prove a point'”
Mercedes motorsport head Toto Wolf slammed the incident as 'absolutely unacceptable'.
“Lap number two of a long race and a crash between two team-mates, we have often discussed the situation and it happened today,” he told the BBC.
“You don't try to overtake with the knife between your teeth in lap number two and damage both cars.”
The team's non-executive chairman Niki Lauda was also fuming.
“It is unacceptable. If these things happen at the end of the race, when they are fighting for the win then you discuss it but in the second lap to hand the victory to Red Bull,” said the former champion.
“I thought they were clever enough to know that but obviously they aren't.”
Hamilton had passed pole-sitter Rosberg at the start but his race was effectively over moments later when Rosberg tried to retake the lead in a misjudged move that could prove extremely costly for Hamilton.
The German's front wing made contact with Hamilton's rear tyre and punctured it, leaving the Briton having to nurse his car back to the pits in a trail of tyre debris.
“Nico hit me. Nico hit me,” Hamilton exclaimed over the car radio.
He rejoined a minute adrift of Rosberg. After complaining that he had no downforce and repeatedly asking the team to save the engine, the Briton was recalled to the pits five laps from the end and retired.
Some of the debris from the tyre's carcass later snagged on Rosberg's radio mast, flapping in his face as he tried to clear it away at 300km/h.
Mercedes have been struggling to keep the peace between the evenly-matched team mates since the start of the year and arrived at Spa after a controversy in Hungary in July, where a 'team orders' controversy left Rosberg aggrieved.
Hamilton had started last in that race and finished third, with Rosberg going from pole to fourth and complaining that his team mate had not let him through.
Then, as on Sunday, the team made clear their support for Hamilton and they will have their work cut out again in the days ahead.
“This is a decisive moment in the battle between the two of them and for the team. Lewis is very upset, we kept him out there for a long time with a damaged car. He will recover quickly. It is going to be handled,” said Wolff.
Rosberg has 220 points to Hamilton's 191 with Ricciardo moving closer on 156. Mercedes remain comfortably in front in the constructors' standings with 411 points to Red Bull's 254.
Kimi Raikkonen finished fourth for Ferrari, the first time he has beaten Spanish team mate Fernando Alonso this season, with Vettel fifth. -Reuters
BELGIAN GRAND PRIX RESULTS
1. Daniel Ricciardo (Australia) RedBull - Renault 1:24:36.556
2. Nico Rosberg (Germany) Mercedes +00:03.383
3. Valtteri Bottas (Finland) Williams-Mercedes 00:28.032
4. Kimi Raikkonen (Finland) Ferrari 00:36.815
5. Sebastian Vettel (Germany) RedBull - Renault 00:52.196
6. Jenson Button (Britain) McLaren 00:54.580
7. Fernando Alonso (Spain) Ferrari 01:01.162
8. Sergio Perez (Mexico) Force India - Mercedes 01:04.293
9. Daniil Kvyat (Russia) Toro Rosso - Renault 01:05.347
10. Nico Huelkenberg (Germany) Force India - Mercedes 01:05.697
11. Jean-Eric Vergne (France) Toro Rosso - Renault 01:11.920
12. Kevin Magnussen (Denmark) McLaren 01:14.262
13. Felipe Massa (Brazil) Williams - Mercedes 01:15.975
14. Adrian Sutil (Germany) Sauber - Ferrari 01:22.447
15. Esteban Gutierrez (Mexico) Sauber - Ferrari 01:30.825
16. Max Chilton (Britain) Marussia - Ferrari 1 lap
17. Marcus Ericsson (Sweden) Caterham - Renault 1 lap
18. Jules Bianchi (France) Marussia - Ferrari 5 laps
r. Lewis Hamilton (Britain) Mercedes 6 laps
r. Romain Grosjean (France) Lotus - Renault 11 laps
r. Andre Lotterer (Germany) Caterham - Renault 43 laps
r. Pastor Maldonado (Venezuela) Lotus - Renault 43 laps
(rank: r = retired, nc = not classified)
Fastest Lap: Nico Rosberg,1:50.511, lap 36.
1. Nico Rosberg (Germany) Mercedes - 220
2. Lewis Hamilton (Britain) Mercedes - 191
3. Daniel Ricciardo (Australia) Red Bull - 156
4. Fernando Alonso (Spain) Ferrari - 121
5. Valtteri Bottas (Finland) Williams - 110
6. Sebastian Vettel (Germany) Red Bull - 98
7. Nico Huelkenberg (Germany) Force India - 70
8. Jenson Button (Britain) McLaren - 68
9. Felipe Massa (Brazil) Williams - 40
10. Kimi Raikkonen (Finland) Ferrari - 39
11. Kevin Magnussen (Denmark) McLaren - 37
12. Sergio Perez (Mexico) Force India - 33
13. Jean-Eric Vergne (France) Toro Rosso - 11
14. Romain Grosjean (France) Lotus - 8
15. Daniil Kvyat (Russia) Toro Rosso - 8
16. Jules Bianchi (France) Marussia - 2
17. Adrian Sutil (Germany) Sauber - 0
18. Marcus Ericsson (Sweden) Caterham - 0
19. Pastor Maldonado (Venezuela) Lotus - 0
20. Esteban Gutierrez (Mexico) Sauber - 0
21. Max Chilton (Britain) Marussia - 0
22. Kamui Kobayashi (Japan) Caterham - 0
23. Andre Lotterer (Germany) Caterham - 0
1. Mercedes - 411
2. RedBull - Renault - 254
3. Ferrari - 160
4. Williams-Mercedes - 150
5. McLaren - 105
6. Force India - Mercedes - 103
7. Toro Rosso - Renault - 19
8. Lotus - Renault - 8
9. Marussia - Ferrari - 2
10. Sauber - Ferrari - 0
11. Caterham - Renault - 0