Victor Wanyama peels away after scoring Celtic’s first goal
Manchester United staged a second-half fightback to defeat Braga and reach the last-16 of the Champions League, while Celtic stunned Barcelona and Chelsea survived a Shakhtar Donetsk fright.
In Portugal, Alan put Braga ahead early in the second half with a powerful penalty, reports the BBC.
A power cut just before the hour resulted in floodlight failure, before play resumed after a 12 minute delay.
Substitute Robin van Persie then fired over a stranded Beto before Wayne Rooney despatched a penalty into the top corner and Javier Hernandez stabbed in a stoppage-time third.
In Scotland, Celtic took a massive step towards the last 16 of the Champions League with an astonishing victory over Barcelona.
They took the lead when Victor Wanyama rose majestically to head past Victor Valdes.
Barcelona pressed for an equaliser, but Tony Watt came off the bench to give Celtic a cushion in the closing minutes.
Lionel Messi tapped home in injury time, but Celtic held on to inflict Barca's first defeat of the season.
It was a momentous victory for Neil Lennon and his men, banishing memories of the injury-time defeat in Barcelona a fortnight ago.
Celtic Park was rocking at a decibel level previously reserved for the most meaningful of Old Firm derbies, but predictably the unflappable maestros of Barcelona paid the partisan crowd no heed as they quickly settled into their fluid passing game.
It brought them the first opportunity of the game six minutes in, but Fraser Forster dealt easily with Xavi's shot despite a touch from Alexis Sanchez just in front of the keeper.
Messi blazed over the bar from a promising position moments later as the pattern of play was quickly established.
Alex Song picked up an early booking for pulling back Miku and a second late challenge on the same player might have cost him his place on the field after just 18 minutes with a more officious referee.
Few inside Celtic Park had cause to debate that for long as the home side snatched the opening goal three minutes later.
The source, as in the game at Camp Nou, was a Charlie Mulgrew set-piece - this time a corner from the right.
His deep delivery was met forcefully by Wanyama, who outjumped Jordi Alba - the man whose late winner broke Celtic hearts two weeks ago - and headed high past Valdes to send the crowd into raptures.
And at Stamford Bridge, a thumping header from substitute Victor Moses sealed a dramatic late win for Chelsea over Shakhtar Donetsk.
Deep into stoppage time Shakhtar defender Razvan Rat conceded a corner, from which striker Moses rose unchallenged to plant his header home.
It was tough luck on the visitors, who had twice come from behind to level through strikes from Willian.
It meant goals from Fernando Torres and Oscar were not in vain, thanks to Moses's late intervention.
In other matches Benfica beat Spartak Moscow 2-0, Bayern hammered Lille 6-1, Cluj lost 3-1 at home to Galatasaray, Juventus outclassed Nordsjaelland 4-0 and Valencia got the better of BATE Borisov 4-2.
UEFA LEAGUE RESULTS
Bayern Munich 6 - 1 Lille
Benfica 2 - 0 Spartak Moscow
Braga 1 - 3 Man Utd
Celtic 2 - 1 Barcelona
CFR Cluj-Napoca 1 - 3 Galatasaray
Chelsea 3 - 2 Shakhtar Donetsk
Juventus 4 - 0 Nordsjaelland
Valencia 4 - 2 BATE Borisov