Alexis Sanchez had equalised for the visitors, scoring on the rebound after Manuel Neuer saved his 30th-minute penalty but the Gunners suffered when captain Laurent Koscielny limped off injured to leave the defence exposed.
Arsenal fear Sanchez injury loss could be 'big blow'.
Manchester United consolidated their fourth place, on 22 points, after first-half goals from Chris Smalling and Wayne Rooney and a brilliant, morale-boosting strike from Robin van Persie after the break sealed a 3-0 victory over Hull City.
Manchester City went 11 points clear with a record 14th consecutive Premier League win in an entertaining derby against Manchester United at Old Trafford.
The club anthem Blue is the Colour resounded around a joyful Stamford Bridge and champagne flowed as Chelsea clinched their first Premier League title for five years with a typically stubborn 1-0 victory over Crystal Palace on Sunday.
Images from the English Premier League matches played at Old Trafford on Saturday
Former Arsenal striker Ian Wright has launched a scathing attack on the club's manager Arsene Wenger, saying he could not make a case for the Frenchman to extend his reign beyond this season.
Champions Manchester United beat Premier League leaders Arsenal 1-0 at Old Trafford on Sunday with Robin van Persie once again tormenting his former team mates with a soaring first half header.
In England, the celebrations went on at Leicester City as they marked their fairytale Premier League success with another win while champions Juventus' long unbeaten streak in Italy came to an end.
Danny Welbeck's hat-trick in a 4-1 thrashing of a feeble Galatasaray side helped ignite Arsenal's Champions League campaign in a lop-sided Group D clash in north London on Wednesday.
Arsene Wenger is confident Arsenal can rekindle the art of winning after a series of frustrating Premier League draws but their quest may be hindered by a "worrying" injury crisis.
Harry Kane's magical season continued on Saturday as he celebrated his first senior England call-up with his first Premier League hat-trick.
Malabar 2016 -- a trilateral maritime exercise involving the Indian Navy, the Japan Maritime Self-Defense Force and the US naval forces in the Indo-Asia-Pacific -- concluded on June 17.
President Ram Nath Kovind on Monday approved a total of 112 gallantry awards for defence and paramilitary personnel for their sacrifices to the nation, the defence ministry said.
Manchester United suffered a double blow on Thursday with Daley Blind ruled out for a 'long' spell due to a knee problem and Radamel Falcao receiving a "new injury" that will keep him out for at least two more weeks.
Danny Rose scored a second-half equaliser to cancel out James Milner's penalty as Tottenham Hotspur came from behind to draw 1-1 with Liverpool at White Hart Lane on Saturday.
Robert Lewandowski scored a brilliant free kick to give Bayern Munich a 1-0 win over Atletico Madrid in their last Champions League Group D outing on Tuesday, ending the 100 percent record of their opponents. The Poland international curled the ball over the wall and into the corner of the net in the 28th minute but the goal had no impact on the final standings with Atletico guaranteed top spot and Bayern in second place.
Arsenal scored twice in the opening seven minutes and ended the match as a contest with a third in the 19th as they crushed Manchester United 3-0 to move above them into second place in the Premier League at the Emirates on Sunday.
Arsenal moved top of the Premier League table but were unconvincing in a 0-0 home draw with Middlesbrough who were well worth their point on Saturday.
'The defence minister needs to focus on human resources-related issues at the same pace in 2017 as he did on acquisitions in 2016,' says Brigadier S K Chatterji (retd).
Barcelona's Luis Suarez hit a brace and set up a double for a spritely Lionel Messi to score in his first start after injury in a rampant 6-1 Champions League victory over AS Roma on Tuesday.
Chelsea face the prospect of having veteran Didier Drogba as their only fit striker for their visit to Manchester United on Sunday in what is usually one of the standout matches of the Premier League season.
Liverpool produce an irresistible performance to dismantle a toothless Tottenham Hotspur 3-0 and Arsenal were held 1-1 by Leicester City in the Premier League on Sunday.
A summary of the results of the major European football league matches on the weekend.
Premier League leaders Arsenal showed their class as they comfortably beat north London rivals Tottenham Hotspur 2-0 to book a place in the FA Cup fourth round in an electric atmosphere at the Emirates Stadium on Saturday.
Arsenal legends Ray Parlour and Sol Campbell says while it might be difficult for the Gunners to recreate the unbeaten season of 2003-04 they could certainly challenge for the title in the coming season provided the club signs up a couple of good players this season.
A soldier cannot justifiably demand faster, easier promotions based on frequent field tenures
Manchester United dropped further down the table after losing 5-3 against newcomers Leicester City. Barcelona and Real Madrid scored 13 goals between them during a memorable La Liga weekend, when Cristiano Ronaldo netted a hat-trick.
Images from the UEFA Champions League matches played across Europe on Wednesday
Why did the district magistrate take over an hour to order retaliatory firing on the murderous SBVS mob?
Get the latest from the world of football and more on Rediff.com.
Jose Mourinho suffered a nightmare homecoming as Porto, the club he led to the Champions League title in 2004, inflicted a 2-1 defeat on his woefully out-of-sorts Chelsea side in Group G on Tuesday.
'Under the present Defence Procurement Procedure, it would have been a nightmare, and a long, long one at that, to build 108 Rafales in India. Modi realised this and took the wise decision, though it is a definitive setback for his Make in India scheme.'
Cristiano Ronaldo renewed his personal battle with Lionel Messi by scoring his 71st Champions League goal, putting him three behind the Argentine's newly-set record, in Real Madrid's 1-0 win at FC Basel on Wednesday.