Jermaine Beckford punished an injury-time blunder by Norwich goalkeeper Fraser Forster to give Leeds a 2-1 victory which sent them back to the top of League One.
Norwich had looked the more purposeful and assured side and seemed destined to take a point until Forster sent a clearance straight to Beckford, who atoned for earlier misses by advancing and shooting past the on-loan keeper.
Leeds seized a 15th-minute lead when Bradley Johnson grabbed his sixth goal of the season, leaping at the far post to head home a corner from the right by Robert Snodgrass. The equaliser arrived when Canaries captain Grant Holt pounced on Simon Lappin's low cross, but Beckford had the final say.
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