League One Southend rocked Chelsea with a stoppage-time equaliser to earn a deserved replay after a 1-1 draw.
The Barclays Premier League side looked to be heading for a place in the fourth round thanks to Salomon Kalou's first-half header.
But the Blues failed to clear a long throw in the 90th minute and defender Peter Clarke was left unmarked to head the ball past Carlo Cudicini.
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