That wraps things up for this session. We'll be back in two and a half hours for the second session, so be sure to join us again then.
Free Practice 1
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Schumacher finishes in third with Perez in fourth, Kobayashi fifth and Webber in sixth.
So, Hamilton tops the timesheets in the first practice session of the weekend, ahead of Nico Rosberg.
Rosberg sets a 1:38.116 to briefly go top but he's quickly trumped by Hamilton who roars round in 1:37.106!
Button also goes quick, but he has to settle for sixth place.
Hamilton goes fastest with a 1:38.146, seconds before the session ends!
Hamilton cannot keep up that initial pace - maybe due to the presence of a yellow flag - and he moves into third with a 1:39.11.
Webber trumps Schumacher with a 1:38.977 and once again the Aussie goes top of the timesheets. But here comes Hamilton, who has gone quickest in the first sector.
Schumacher goes fastest with a 1:39.318... how can Webber respond?
There's finally a bit of movement in the standings as Webber goes quickest in the first sector.
Hulkenberg moves up to sixth with a lap of 1:42.890.
Perez slots into fourth place with a 1:42.419, behind Maldonado, Grosjean and Webber.
We're edging towards the end of this first session, and still Webber is pacing it. Nineteen cars have now set times, but we're still waiting for the McLaren duo of Hamilton and Button to clock something concrete.
Caterham on Twitter: "Heikki reports that it's too dry for inters. Both cars coming back for slicks."
Button, who is out taking a look at the track, is told that the first cars are going out on prime tyres.
Vettel clocks a lap of 1:44.850 to slot into seventh place.
Vettel heads out and he will try to get to grips, literally, with the damp track.
Button and Hamilton are just sat in their respective cars with no indication that they're going to be doing otherwise for time being.
Kimi is told he has to switch off his DRS system by his team and operate it manually.
But it's Webber who still leads FP1 with a 1:39.558 with just over 20 minutes remaining.
Kimi has added a time to the list, as has Schumacher.
Timo Glock is asked on radio if he needs new underwear. He doesn't, but he would have done had he not righted his car as it slid off track!
Here comes Alonso, to break the inactivity on track.
So, to update you, Webber is still fastest so far today. The Aussie is followed by Grosjean, Maldonado, Ricciardo, Kovalainen, Massa, Rosberg, de la Rosa, Vergne and Karthikeyan - the only 10 drivers to have completed timed laps so far.
It's suddenly gone misty around the track and there's no hurry from the teams to get their drivers back out on track just yet.
The track goes quiet once again and all cars are back in the pits as the drizzle becomes heavier.
Snowplough, cheese grater, lawnmower, oven grill - various descriptions suggested so far for Lewis Hamilton's air flow measurer.
Massa, fresh from that wobble, records a time of 1.44.022 to go fifth quickest.
McLaren on Twitter: "Conditions look pretty tricky out there - it's damp and greasy. And, because it's cold, there's very little grip too."
Webber is still quickest so far, followed by Grosjean, Maldonado, Ricciardo, Rosberg, De La Rosa, Vergne, Massa and Karthekeyan. That's all the timed laps we have so far.
Massa goes close to the gravel as he slips very wide on the greasy surface.
It's started to spit slightly out there. That would account for the slides suffered by Karthikeyan and Vergne.
Karthikeyan is next to post a time: 1:57.543.
Webber improves to 1:40.647, and Ricciardo slots in behind him with a 1:45.924.
Webber becomes the first man to set a time with a 1:44.542.
It's still damp and cold out there as Karthikeyan slides onto some astroturf before continuing on his way.
An hour remaining in this first session in Shanghai.
Really, there's not much happening at the moment, the action on the track rather reflecting the grey skies above.
Schumacher heads out on some medium compound slicks.
Paul Di Resta tells the Beeb that he's been "recharging his batteries" since the last time out. He's not driving this session.
We're still waiting for anyone to set a flying lap time.
Mercedes' Rosberg too now on a set of intermediates.
It's gone quiet out on track now - just Pic out there at the moment.
Hamilton's back in the garage, sat in his car as his team busy themselves around him.
Jules Bianchi is another test driver getting a run out in this session - he's replacing Paul di Resta in the Force India.
The contraption on the back of Hamilton's McLaren looks like a grill that you would do your toast on.
Here comes Hamilton now. His car has a weird device fitted to the back that will measure air flow.
All cars have now completed an installation lap, with the exception of Lewis Hamilton.
It's a bit damp out there today and intermediate tyres are the popular choice.
Back to the Bahrain news and Red Bull team boss Christian Horner has said: "We have to follow and trust the FIA. They are closer to the situation than we are. I'm sure they're taking all the necessary advice. If the FIA say the race is going to happen, we'll certainly be there."
Both Red Bull drivers have completed installation laps...
Red Bull are very much using this session to test out new settings for both Vettel and Webber.
Caterham test driver Giedo van der Garde is also out of track. He's in for Vitaly Petrov today.
Humidity is at 83 per cent in Shanghai today. It's overcast and grey.
Kovalainen and Kobayashi are the first men out on track today.
Here we go then! An hour and a half of practice to follow!
Weather update from the Shanghai International Circuit: 14 degrees air temperature, 13 degrees on the track. In other words, pretty chilly.
For the time being though, all eyes are on the track in China, where Lewis Hamilton has it all to do after receiving a five-place grid penalty.
So, the big news in the world of F1 is that the Bahrain GP WILL go ahead, according to the FIA.
Hello and welcome to our live coverage of today's first free practice session ahead of Sunday's Chinese Grand Prix.