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Arsenal fans were left furious when a penalty allowed Tottenham to equalise in their north London derby clash at Wembley.

Harry Kane appeared to be in an offside position when Christian Eriksen's free-kick was floated into the box before he was fouled by Shkodran Mustafi.

The linesman kept his flag down and referee Anthony Taylor pointed to the spot before Kane made no mistake to level the scores.

"We've had a few this year not go our way, but luckily we had one go our way," Kane said after the game.

Gunners fans and players felt hard done by given Kane's offside position when the cross came in and Martin Keown blasted the officials on BT Sport.

(Image: Getty Images)

"How many of those Spurs players are offside? How obvious is that?" Martin Keown said after the game.

"Yes it's a foul, but the linesman's flag should have already gone up for offside."

But the laws show Taylor was right to give the penalty - and this is why.

FA rules state that if "a player in an offside position is moving towards the ball with the intention of playing the ball and is fouled before playing or attempting to play the ball, or challenging an opponent for the ball, the foul is penalised as it has occurred before the offside offence."

As a result, Mustafi's foul on Kane took place before he was deemed to have committed an offence by being in an offside position, therefore the penalty was the right call.

(Image: Getty Images)

There was more controversy late in the game as Davinson Sanchez was deemed to have shoved Pierre-Emerick Aubameyang in the box late on.

The Arsenal man saw his last-minute spot kick saved by Hugo Lloris as they missed the chance to snatch a late victory from Spurs.

The result keeps Spurs four points ahead of their local rivals in third place in the table, with Manchester United having a chance to leapfrog the Gunners for fourth spot if they win their 3pm kick-off against Southampton at home.