Arsenal reached the FA Cup final as they beat Wigan on penalties in the semi-final at Wembley.
However the Gunners got back on level terms via Per Mertesacker eight minutes from the end.
The match finished 1-1 after 120 minutes and Arsenal won 4-2 on penalties with Santi Cazorla converting the winning spot kick.
Arsene Wenger's side will face Hull or Sheffield United in next month's final.
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