Red Bull's Sebastian Vettel has said he is not sure why he suffered a tyre failure on Friday during second practice for this Sunday's Belgian Grand Prix.

The incident occurred in the final third of FP2, but despite missing the final 20 minutes of the 90-minute session, the German still ended proceedings on top, his best lap a 1 minute 55.636 seconds, which put him fractionally up on his team-mate, Mark Webber and over eight tenths up on Romain Grosjean in third.

"We don't know what happened when I got the puncture in P2. We lost the rear right, very suddenly, so we need to have a look - Pirelli is working on finding out why it happened," Vettel stated. "Other than that though, it was a positive day."

"This morning was tricky with a few rain drops and the track was slippery; it's a lot colder here than Hungary, but that's Spa and part of this circuit," he added. "This afternoon, we had stable conditions and both of us seemed happy with what we had."

Webber meanwhile was similarly upbeat, and his best effort left him only 0.059 seconds off the sister car: "It's always tricky here to get the right set up for the whole lap, so we took the opportunity today to try some different ones," the Aussie explained.

"We'll go through it tonight now. We had a pretty good run today although there's still some performance to find and we need to get the car a bit better balanced in certain conditions. Overall we got good information and it was good to have stable conditions this afternoon."

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