Right, well that's the end of the first session. Lewis Hamilton leads the way early on. It's a sweltering evening in Singapore, but the teams have plenty more work to do. We are back for 90 minutes (hopefully) more practice at 14:30 UK time. Join us then.
Free Practice 1
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The chequered flags are out as 15-odd cars chareg round on one final hot lap.
And we're off again. The cars are queuing in the pit lane hoping to get a couple of sharp laps in.
The kerbing is being removed very quickly, and we hope to be back under way for the last knockings of a largely shambolic session.
RED FLAG! More kerbing has come loose between turns seven and eight. This is a real embarrassment for race organisers. It's the same problem that caused the session to be delayed by 30 minutes.
Great lap from Lewis Hamilton! He puts four tenths on Vettel with a 1:48.599. Exciting stuff, not that it will mean much in the context of the weekend.
Lewis Hamilton slots into second place with a 1:49.515 lap - Webber has had his wing replaced and is back out on track. He lies third.
And faster again from Vettel. 1:49.005 - absolutely cracking pace.
Oh, that's even faster from Sebastian Vettel. 1:49.656 from the German, who does not even appear to be trying very hard. Sickeningly good.
Everybody has clocked a flying lap. Bottom of the pile is HRT's Daniel Ricciardo, who is still getting used to the car - which he has described as "a bit pointy". The Australian is 11 seconds off the pace.
And now Vettel goes fastest - 1:50.082, which bests button by nearly nine tenths of a second!
Jenson Button finally gets on the timesheet - 1:50.952 for the Briton and that is the fastest of the day by over a second.
The more OCD-inclined among you may be pleased to discover Rubens Barrichello has managed to stop the clock at precisely 2:00.000.
And off we go again... incidentally, five drivers have yet to record a timed lap - Kamui Kobayashi, Jarno Trulli, Fernando Alonso, Lewis Hamilton and Jenson Button.
It has been a frustrating session alright - Sergio Perez has been the most active driver today, clocking up nine laps.
The clock continue to tick as Kovalainen's Lotus is hoiked off the track.
FIRE!! Heikki Kovalainen has another fire, and this time it's the brakes. He gets out unscathed and shows a marshal to the problem. And the red flag is out until this mess can be cleared up.
CONTACT! Webber collides with Timo Glock as he tries to squeeze past the Virgin driver! He had been trying to get past Glock for some time, but the German was under no obligation to make way and Webber has lose a bit of his front wing!
How they stand: 1-Massa, 2-Webber, 3-Sutil, 4-Di Resta, 5-Petrov, 6-Senna, 7-Schumacher, 8-Alguersuari, 9-Kovalainen, 10-Maldonado.
The floodlights are on as a lovelty sunset engulfs the Marina Bay circuit. It may not be every driver's favourite, but it creates a great spectacle.
Massa clocks a 1:52.043, that's a bit more like it. The track is pretty dusty so we can expect times to get quicker as the weekend progresses.
Vitaly Petrov and Bruno Senna both record laps in the 1:59s...
Just as a reference, last seasons pole time from Fernando Alonso was 1:45.390 - so we can expect these early lap times to tumble considerably.
Schumacher weighs in with a 1:55.827 lap...
Right, now Nico Rosberg is on a flier... 1:57.351. The first timed lap of the Singapore GP weekend.
And it's all gone quiet again. A stop-start opening to the weekend's action.
And here is Vettel. It's just installation laps at the moment - no timed laps just yet.
As you'd imagine, it's a busy track what with the session having 30 minutes shaved off it. Sebastian Vettel is the only man not to come out of the pits.
And Timo Glock runs wide! His brakes lock up and he goes straight on. He manages not to hit anything and continues on his merry way. He'll have some flat spots, though.
And we're off!! This curtailed 60-minute session is under way after emergency track repairs. Kerb at turns 3 and 14 has been removed.
FIGHT!! Amazing scenes down in the pit lane as two photographers get into a scuffle. They are hitting each other with their tripods and it is all getting very nasty indeed. Sadly, the TV cameras pan away before we see the denouement.
There is a team of workers removing the offending bits of kerb and nailing down replacements. All a bit ramshackle from what is usually a supremely-organised event.
It is indeed loose kerbs that are the issue. Valuable track time being lost here...
Marshals are poking tenatively at some kerbs at turn 3, and it looks as though they may be removed. They are rather loosely attached. Difficult to know exactly what the issue is here.
It is expected that this session will be reduced to an hour - the teams need two hours to prepare for the second practice session, which starts at 14:30 UK time.
That means we will be under way at 11:30 UK time. There is some puzzlement in the paddock as to why the repairs have not already been completed - they have had around an hour and a half to do so.
DELAY - The start of Free Practice 1 has been delayed by 30 minutes due to track repairs on the Marina Bay circuit between turns 14 and 15. There is oil on the track following a support race.
Welcome to live coverage of the first free practice session ahead of the Singapore GP from the Marina Bay street circuit! The action gets under way at 11:00 UK time.