A gunman has been arrested after entering a Florida high school and shooting dead at least 17 children and teachers and injuring as many as 18 others.
Suspect Nikolas Cruz, 19, was apprehended by local police after a brief manhunt following the attack on the Marjory Stoneman Douglas High School in Parkland, north of Miami.
Cruz was previously expelled from the institution for "disciplinary reasons", it has emerged.
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