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Alexis Sanchez rescued a point for Arsenal as they came from behind to draw 1-1 with Paris St-Germain in their Champions League Group A clash at the Parc des Princes.
The Gunners suffered the worst possible start when Edinson Cavani put the French champions ahead after just 42 seconds.
The Uruguayan should have ended the game as a contest before the break but he shot wide after rounding the recalled David Ospina before he later slipped with the goal at his mercy.
Arsene Wenger's side improved in the second period and they were level with 13 minutes left when Sanchez fired home with their first shot on target.
Arsenal pressed for an unlikely winner and Alex Iwobi had a good opportunity to grab one but the chance was wasted.
Stoppage time saw a pair of red cards as substitute Olivier Giroud and PSG's Marco Verratti were both dismissed for receiving their second yellow cards for an off-the-ball incident.
In the other match in Group A, Swiss side Basel were held to a 1-1 at home to Ludogorets of Bulgaria.
In Spain, Celtic suffered their heaviest ever European defeat as a rampant Barcelona hit seven goals without reply.
The Catalans lost to newly-promoted Alaves at the weekend and Celtic suffered the backlash as Lionel Messi grabbed a hat-trick, Luis Suarez bagged a brace while Neymar and Andres Iniesta were also on the scoresheet.
The Argentine opened the scoring after just three minutes before he poked in a superb second after playing a couple of one-twos to cut through a shambolic Celtic defence.
The Scottish champions should have been level before Messi's second but Moussa Dembele's casual spot-kick was palmed to safety by Marc-Andre ter Stegen.
Neymar's free-kick on 50 minutes and Iniesta's first Champions League goal in four years nine minutes later made it 4-0 before Messi completed his hat-trick on the hour-mark.
Suarez smashed home a stunning volley on the turn before side-footing home late on to cap a miserable night for Brendan Rodgers' side.
Manchester City's tie with Borussia Monchengladbach meanwhile was abandoned after the Etihad pitch was waterlogged following heavy storms in Manchester.
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