Nico Rosberg led an incident-packed Monaco Grand Prix from start to finish to score his second career victory.
However Mercedes are under protest after it emerged they conducted a three-day tyre test following the previous round in Spain.
Sebastian Vettel and Mark Webber joined Rosberg on the podium. Both jumped ahead of Lewis Hamilton during the first pit stop, which came during a safety car period.
It followed a heavy crash at Sainte Devote for Felipe Massa which was very similar to the one he had during final practice. The Ferrari driver hit the barrier driver on the left then suffering a second impact at the corner itself. He was taken to hospital for checks.
Rosberg held the lead after the race restarted but on lap 45 it was red-flagged following another crash. Max Chilton and Pastor Maldonado collided at Tabac, sending the Williams flying into the barriers.
The shunt dislodged one of the barriers and Jules Bianchi hit it, damaging his front wing. The race was immediately red-flagged.
The drivers took advantage of the the interruption to put fresh tyres on, which made for a tense final sprint to the chequered flag. It was interrupted by another safety car deployment when Romain Grosjean crashed into Daniel Ricciardo at the chicane.
Sergio Perez moved up to fifth but dropped out with brake failure after tangling with Kimi Raikkonen. The Lotus driver was forced to pit, but having fallen to the back of the field recovered to take the final point at the last lap.
Adrian Sutil passed Fernando Alonso and Jenson Button on his way to fifth place. Jean-Eric Vergne finished eighth ahead of Paul di Resta.
2013 Monaco Grand Prix
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- Ricciardo told Grosjean “you’re an idiot” after crash
Image ?é?® Daimler/Hoch Zwei