All times set on mediums so far.
Nasr turns in a 1:37.229 to split the Ferraris in third.
Grosjean running very deep into Turn 10 with a big, big lock-up as he rounded that slow apex.
@ShreyKundra: Very early to say anything yet, as this is only practice and there's a lot we don't know about fuel loads etc.
@f1f: I think they'll be in a similar position to China, battling for scraps. Could be a painful through races until that B-Spec car arrives in Austria.
Oh dear. Button has stopped again, this time at Turn 11. Looks like he's just pulled over to one side, can't see any sign of smoke coming from the McLaren. Five laps completed all day by the 2009 world champion. Is that a recurrence of the FP1 issue or a new one?
@Rodster: Hi Rodster. Yes, we are currently having some issues with the header scoreboard at the top of the screen but hope these will be back soon.
Grosjean having a very messy end to his latest flying lap as he crosses in 14th.
@GaneshBala: Yes, the plan was to up the power this weekend ahead of an upgraded engine being introduced at the Spanish Grand Prix in three weeks.
@Gr8Guns: As I say, we hope these will be back on the site ASAP as they were very useful - even for Laurence and myself!
@alexp: No news from Red Bull yet. Currently the gap out in front is just 0.100s.
Rosberg has moved into third and is now three tenths down on Hamilton.
Rosberg on the radio complaining about photographers on the side of the entry to the pit lane. A replay on his on boards showed them standing pretty close to the circuit.
@mtpineda2003: That's not been confirmed yet.
@GaneshBala: Button is much more sensitive a driver. Alonso's aggressive style means he basically takes a car by the scruff of the neck and drives around its weaknesses. You'll often hear Button giving much more feedback about oversteer and understeer.
@mtpineda2003: Soft and medium.
We have one of the two Red Bull's on track as Kvyat enters the fray.
@bjorn: He switched between old and new in FP1. I'll try and get a glimpse and report back.
@alexp: Absolutely. There's much more to building a race-winning F1 car than being quick in a straight line. Mercedes' strength comes from all sorts of other variables. Last year Williams was consistently the quickest team in a straight line, but didn't win a race.
This time is Maldonado who runs wide at the final corner.
@Gr8Guns: Manor also has Ferrari engines.
Albeit 2014-spec engines...
Raikkonen has bolted on some soft tyres and leaps to the top of the timing screens. He's gone 1.3s quicker than Hamilton's medium time.