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England began their quest for a first European Championship trophy with two tepid performances against Serbia and Denmark that drew flak from former players turned pundits Gary Lineker, Rio Ferdinand and Alan Shearer, among others.
It was a second successive lacklustre performance from Gareth Southgate's men, who squandered the chance to become the first England team to win their two opening games at a Euro tournament.
A game billed as a crucial six-pointer in the race to secure Champions League qualification was effectively all over before the clock had reached 10 minutes as fifth-placed Tottenham collapsed like a pack of cards.
England's skipper struck a penalty past Italy keeper Gianluigi Donnarumma shortly before halftime to make it 2-0 and take his tally to 54, one more than Wayne Rooney.
Nottingham Forest beat Southampton to move out of the relegation zone.
The Gunners maintained their 100 per cent home record. They have 40 points from 15 games.
Having been a teammate of Kane at Tottenham for the best part of a decade, the 35-year-old was quick to reach out to the striker who was crestfallen at the final whistle.
Kane had scans on Wednesday but England manager Southgate said there was no serious damage.
Two goals from Bukayo Saka and strikes by Jude Bellingham, Raheem Sterlinga, Marcus Rashford and Jack Grealish rounded off the rout.
Five different players scored for England with Bukayo Saka bagging a brace. Mehdi Taremi hit both of Iran's goals.
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