Slavia Prague scored a dramatic stoppage time equalizer to leave Arsenal's Europa League ambitions hanging in the balance.
Substitute Nicolas Pepe thought he had earned the Gunners a slender quarter-final first-leg advantage when he broke the deadlock in the 86th minute.
But Tomas Holes headed home in the dying moments of the game from close range to give Slavia Prague a precious away goal.
The second leg in Prague takes place next Thursday and Gunners boss Mikel Arteta, despite his side conceding so late, still believes they will progress to the semi-finals.
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