Postpublished at 90+3 mins
West Ham 1-5 Arsenal
Arsenal should have had 10 today. And I NEVER over-exaggerate.
Alexis Sanchez puts Aaron Ramsey in but the Welshman's shot on the stretch spins off the Hammers keeper.
Summary
Sanchez scores classy hat-trick
Carroll scores for first time this season
Gunners move up to second in table
West Ham one point above relegation zone
Postpublished at 90+3 mins
Postpublished at 90+1 mins
West Ham 1-5 Arsenal
Into three minutes of stoppage time and Alex Oxlade-Chamberlain almost makes it six - but Darren Rabdolph saves with his feet.
West Ham have crumbled.
Fire drillpublished at 19:21 Greenwich Mean Time 3 December 2016
West Ham 1-5 Arsenal
Nick Godwin
BBC Radio London commentatorPeople are leaving. As in, it's like there's a fire drill. Thousands are off, and within the last 90 seconds the London Stadium is suddenly half empty, under 20,000 now in here.
Image source, Getty ImagesPostpublished at 90 mins
West Ham 1-5 Arsenal
Might need to rename the London Stadium to the Lon-gone Stadium. It's empty now.
'Sanchez is a pearl'published at 19:20 Greenwich Mean Time 3 December 2016
West Ham 1-5 Arsenal
Bradley Allen
Ex-QPR striker at London Stadium for BBC Radio LondonSome supporters have already left, but shame on you if you've left early. You've missed a wonderful forward's performance.
Sanchez is a pearl of a player - if you're a young striker then watch this guy. It's a pleasure to sit here and watch him.
Image source, PA
GOAL - West Ham 1-5 Arsenalpublished at 86 mins
Alexis Sanchez
What's going on?
Everything's gone a bit bonkers.
Alexis Sanchez has been masterful today and now he has a match ball.
Mesut Ozil slips the Chilean in - although he looks just offside - and the finish... my word. Sanchez fakes one shot and then finally dinks the ball over Darren Randolph to nail the Hammers.
Image source, Reuters
Image source, EPAGOAL - West Ham 1-4 Arsenalpublished at 84 mins
Alex Oxlade-Chamberlain
Blimey!
Goal rush. Fun times at the London Stadium, although not if you're a West Ham fan - streams of Hammers supporters are heading to the exits.
Alex Oxlade-Chamberlain fires in a lovely finish from the edge of the area.
Image source, ReutersGOAL - West Ham 1-3 Arsenalpublished at 83 mins
Andy Carroll
Maybe we're not done here.
Dimitri Payet hits a trademark free-kick from 20 yards or so that comes back off the woodwork.
The Arsenal defenders are playing musical statues and Andy Carroll nods in the rebound.
Image source, Rex Features'West Ham failed'published at 19:13 Greenwich Mean Time 3 December 2016
West Ham 0-3 Arsenal
Bradley Allen
Ex-QPR striker at London Stadium for BBC Radio LondonA beautiful finish from Alexis Sanchez. West Ham failed to challenge for the ball further up the pitch, which lead to the ball coming to Sanchez. He allowed it to drift across his body before arrowing it into the far corner.
Image source, ReutersGOAL - West Ham 0-3 Arsenalpublished at 79 mins
Alexis Sanchez
From brilliance to opportunism.
Mesut Ozil tries to trot into the West Ham area, but the ball springs loose to Alexis Sanchez on the edge of the area and the Chilean drags a shot across Darren Randolph for his second and Arsenal's third.
Image source, AFPPostpublished at 78 mins
West Ham 0-2 Arsenal
Four of Arsenal's last five Premier League goals have involved Alexis Sanchez in some shape or form.
The Chilean has three goals and one assist.
Image source, ReutersSUBSTITUTIONpublished at 76 mins
West Ham 0-2 Arsenal
Andy Carroll is on for Mark Noble.
And the West Ham striker's first touch is rusty to say the least - he tries to control the ball and it goes out for a throw-in.
Basically the exact opposite of what Alexis Sanchez just did.
'That should seal the game for Arsenal'published at 19:05 Greenwich Mean Time 3 December 2016
West Ham 0-2 Arsenal
Bradley Allen
Ex-QPR striker at London Stadium for BBC Radio LondonAlexis Sanchez has been relentless all evening, and sometimes strikers get rewarded for their effort, for running hard, for never giving up. His strength there was brilliant with his small frame and low centre of gravity. That should seal the game for Arsenal.
Andy Carroll's primed to come on. It's just 30 seconds too late.
Image source, ReutersGOAL - West Ham 0-2 Arsenalpublished at 72 mins
Alexis Sanchez
Brilliance. Wonderful individual brilliance.
Alexis Sanchez is given a pass from Shkodran Mustafi that might as well have been fired from a cannon.
But the Chilean's first touch could well have been performed by a whooppie cushion - it's soft and lovely and it allows him to spin away from Anthony Makuanu and into the area, before angling the finish past Darren Randolph.
Image source, AFP'Great reflexes on show'published at 19:02 Greenwich Mean Time 3 December 2016
West Ham 0-1 Arsenal
Bradley Allen
Ex-QPR striker at London Stadium for BBC Radio LondonIf West Ham somehow salvage something from this game they'll be so thankful to their goalkeeper for that superb double save.
No criticism of the Arsenal shots - technique spot on - but great reflexes on show from Randolph.
Image source, Getty ImagesPostpublished at 71 mins
West Ham 0-1 Arsenal
Arsenal, not content with making individual chances, have two point-blank efforts saved brilliantly by Darren Randolph.
Alex Oxlade-Chamberlain releases the overlapping Nacho Monreal down the left and the cut-back finds Aaron Ramsey - but it's saved - and Mesut Ozil's acrobatic follow-up is also superbly stopped.
Image source, Getty ImagesGet involvedpublished at 18:59 Greenwich Mean Time 3 December 2016
#bbcfootball
YELLOW CARDpublished at 68 mins
West Ham 0-1 Arsenal
Laurent Koscielny manages to get a booking for fouling Ashley Fletcher with his head.
Odd one, that.
Gunners looking dangerouspublished at 18:58 Greenwich Mean Time 3 December 2016
West Ham 0-1 Arsenal
Bradley Allen
Ex-QPR striker at London Stadium for BBC Radio LondonWonderful, sweeping move by Arsenal. Sanchez reversed the ball for Walcott who was up on the overlap. The England man pushed into the box then tried to square it back, but it was well intercepted for a corner.
Image source, ReutersPostpublished at 67 mins
West Ham 0-1 Arsenal
Angelo Ogbonna has just put in a block of substantial excellence.
Theo Walcott's trigger is ready to be released and the West Ham defender flies in from nowhere to stop the shot.
Andre Ayew's change eventually came, replacing Edimilson Fernandes for West Ham.
And now Walcott's off, with Aaron Ramsey on.