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Arsenal 2-1 Manchester City
Got to score! Dear oh dear Danny Welbeck. A free header no more than five yards out, and he puts it wide.
What a miss!
Arsenal will play Chelsea in final on 27 May
Sanchez hits winner from four yards out
Toure & Fernandinho hit woodwork
City also had goal controversially ruled out
Tom Rostance
Arsenal 2-1 Manchester City
Got to score! Dear oh dear Danny Welbeck. A free header no more than five yards out, and he puts it wide.
What a miss!
Arsenal 2-1 Manchester City
Jermaine Jenas
Former England midfielder on BBC Radio 5 live
Oxlade Chamberlain has been brilliant. He is one of the players who grabbed the game by the scruff of the neck and said 'we are not going to lose like this'.
Arsenal 2-1 Manchester City
Into added time at the end of the first period of extra time. That's not easy to say.
City trail and they haven't really threatened at all in the extras.
#bbcfacup
Matt Robinson: Arsenal showing some fight and dominating now deserve to be leading city look lost
Zach Kingsbury: The goal that earns Wenger ANOTHER season?
Arsenal 2-1 Manchester City
Arsenal 2-1 Manchester City
Alex Oxlade-Chamberlain is off, Hector Bellerin on. The Ox has really impressed in the last two games at wing-back. Have Arsenal finally found his position?
Arsenal 2-1 Manchester City
This game was on the verge of bubbling over at the end of the first half and there's now a scuffle between a whole host of players. Fabian Delph is booked as a result as the captains are called in to calm it down.
Arsenal 2-1 Manchester City
Jermaine Jenas
Former England midfielder on BBC Radio 5 live
The Arsenal back three are covering each other very well.
Arsenal 2-1 Manchester City
Phil McNulty
BBC Sport chief football writer at Wembley
It is a scramble but how much will that goal mean to Arsenal? Arsene Wenger's side have shown real grit here today and now have that crucial extra-time advantage thanks to Alexis Sanchez.
Wenger looks calm on the sidelines but this would be a huge win for him.
Arsenal 2-1 Manchester City
Raheem Sterling wriggles into the area and puts across a very testing ball - cleared from inside the six-yard box!
Arsenal 2-1 Manchester City
Martin Keown
Former Arsenal defender on BBC TV
It seems every time the ball goes into the box at either end, defences fail to deal with it. Sanchez is just too quick for Kompany there. You look at Arsene Wenger's record in this competition - it's clear he's not letting go of this easily.
Arsenal 2-1 Manchester City
Jermaine Jenas
Former England midfielder on BBC Radio 5 live
I wouldn't say it has been his most lively game but Sanchez is usually a player who pops up at big moments.
He wasn't going to pass up on an opportunity six yards out.
Arsenal 2-1 Manchester City
He's barely been in the game at all but Arsenal's man for the big occasion comes up trumps once more. A free-kick is nodded down, Danny Welbeck miskicks inside the six-yard box, Gael Clichy is weak and Alexis Sanchez muscles him off the ball and stabs in from just a few yards out.
Can a depleted City come back from this?
Alexis Sanchez
Arsenal lead!
Arsenal 1-1 Manchester City
So it looks like Kevin de Bruyne is going to play up front for Manchester City. That's three changes they have made but remember, you can make a fourth in extra time now in the FA Cup.
Arsenal 1-1 Manchester City
Jermaine Jenas
Former England midfielder on BBC Radio 5 live
Aguero is very tired. He is not exactly complaining as he goes off the pitch.
Arsenal 1-1 Manchester City
On come Fernando and Fabian Delph, Sergio Aguero and Fernandinho come off.
Aguero looks very weary indeed.
Arsenal 1-1 Manchester City
Fernandinho is now down injured for Manchester City. Pep might have to play himself on Thursday at this rate.
Arsenal 1-1 Manchester City
Jermaine Jenas
Former England midfielder on BBC Radio 5 live
Arsenal look far more dangerous going forward than Manchester City do.
Arsenal 1-1 Manchester City
Good play Danny Welbeck, into the area, beating Gael Clichy once, but not twice and that's a corner.
And you've got to score that! Rob Holding has a free header, about four yards out, and he puts it over!
That was the chance.