Walcott heads Arsenal in front from Sanchez cross
Walcott fires Gunners' second after Sanchez pass
Latest: Celtic 3-3 Manchester City
Napoli, Barcelona & Bayern Munich also in action
Napoli have doubled their lead over Benfica, with Dries Mertens' superb free-kick making it 2-0 in Italy.
PSG have turned it around at Ludogorets. Edinson Cavani's goal, assisted by Angel di Maria, has made it 2-1 to the French side.
Image source, ReutersArsenal 2-0 Basel
Straight off the playground from Alex Iwobi as he toe pokes an effort at goal. It's not far off to be fair, flashing just wide of the post.
The Gunners have picked up from where they left off in the first half.
Pat Nevin
Ex-Chelsea winger on BBC Radio 5 live
That's David Silva at his very best, an eye-of-a-needle ball. Gordon makes a good save, but Nolito is following up. That's the Manchester City we expected to see tonight.
Nolito (55 mins)
There was no way there was going to be no more goals in this game, was there?
Manchester City hit back once again as Sergio Aguero is played through by a peach of a ball by David Silva, his shot is blocked by Craig Gordon but Nolito strokes home the rebound.
All square again.
Arsenal 2-0 Basel
Arsenal come forward again as Marek Suchy shows Alexis Sanchez some of the ball and the Arsenal forward is on it in a flash. He then races towards the area before trying to pick out Theo Walcott but Taulant Xhaka is back to stab away the pass.
#bbcfootball
Anthony Miller: Celtic doing themselves and the fans proud, no matter the outcome, there is clear potential at paradise.
Richard: City are going to win this game 5-3.
Arsenal 2-0 Basel
Theo Walcott breaks clear of the defence to latch onto a ball through the defence. Surely a third? No, Basel are saved by the offside flag.
Arsene Wenger fumes at the fourth official but he should have no complaints. Definite offside.
Earlier we asked you to cast your vote on whether you think Arsene Wenger would be the right choice as England manager, and 59% of you think he would be.
Get them playing like Arsenal are tonight and I can get on board with that.
Celtic 3-2 Manchester City
Pat Nevin
Ex-Chelsea winger on BBC Radio 5 live
He hooked it in to the back of the net, Bravo could only watch. We asked for more of the same and we're getting it. Dembele got a hat-trick against Rangers and now he's looking for one here. The centre-back pairing he's up against doesn't look great.
Image source, PAWant to be involved in the reaction to this remarkable match? BBC World Service football reporter John Bennett will be taking your questions live at full-time on the Match of the Day Facebook page., external
Moussa Dembele (47 mins)
What a game this is!
Just like they did in the first half, Celtic start quickly and are rewarded with a third. Kieran Tierney crosses, Aleksandar Kolarov fails to clear and Moussa Dembele flicks the ball up with his knee before volleying home on the turn.
Brendan Rodgers points to the sky in celebration.
Image source, Getty ImagesSome excellent entertainment in the first half. More of the same?
Back under way in the Champions League.
Image source, ReutersLidiardo: Arsenal incredible tonight. Wenger doing his utmost to get a new contract just to avoid getting the England job!
Andy Bradley: Have to say this is Arsenal's strongest line up. Iwobi really showing Oxlade- Chamberlain what taking your chance looks like
Arsenal 2-0 Basel
Image source, .Theo Walcott was absolutely unplayable in that half. Brilliant performance and a constant menace to that Basel defence. He had more touches in the box than any other player on the pitch with eight (above)
Alexis Sanchez (below) isn't far behind with six.
Image source, .David knows.
A late first-half goal has pegged Rostov back again. Luuk de Jong - formerly of Newcastle - has levelled again for PSV. It is 2-2.
Atletico Madrid hold a 1-0 lead over Bayern Munich in the big clash in Spain. The news is less good at the break for Barcelona, who trail their German opponents Borussia Monchengladbach by a single goal.
Besiktas and Napoli both lead 1-0 in Group B, against Dynamo Kiev and Benfica respectively.
In Arsenal's group PSG are drawing 1-1 at Ludogorets.
Image source, APCeltic 2-2 Manchester City
Though the scores are level, Manchester City have had much more of the ball and territory. The visitors have also had 12 attempts on goal to Celtic's eight.
Image source, OptaNick Hughes: Walcott in great form. So it would be typical for him to be called-up by #England, external next week and get injured.
Eddie: Wow..#Arsenal, external putting on a football clinic at the Emirates tonight!!!
Kris Jefferson: Although Arsenal are playing well, you always feel they need that one more goal to make sure.
Come on Kris, don't be so negative! Arsenal are in absolute control. As good as I've ever seen them.
Pat Nevin
Ex-Chelsea winger on BBC Radio 5 live
It's been a fantastic contest. Celtic need the rest much more - City have had more of the ball and Celtic have had to chase. It's been a fantastic effort by both side.
Half time at Arsenal and half time at Celtic. The Gunners in control at 2-0 while Celtic's game with Manchester City is evenly poised at 2-2.