Nicklas Bendtner's hat-trick helped Arsenal to an imposing 5-0 FA Cup victory over Leyton Orient and a quarter-final clash with Manchester United at Old Trafford.

Marouane Chamakh's first goal since November got the ball rolling in just the seventh minute, before Bendtner netted a first-half double.

The Denmark international followed up his fine header and 18-yard drive with a 62nd-minute penalty to complete his treble, with substitute Gael Clichy wrapping up the result as he struck his first goal since November 2008.

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