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DUBAI, United Arab Emirates (CNN) -- A bridge under construction at a marina collapsed Thursday, killing seven workers and injuring 25, nine critically, the head of Dubai police said.
A crane operator at Dubai Marina made a mistake while trying to fix a "steel board" over a group of metallic pillars and accidentally knocked off one of the pillars, police said. That created a chain reaction that led to the bridge's collapse.
The incident triggered a traffic jam stretching several miles as police and ambulances scrambled to reach the scene. E-mail to a friend 
From CNNArabic's Abdel Halim Huzayen
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