A police school safety officer stands outside the New Millennium Business Academy Middle School in the Bronx, which was evacuated after a teacher barricaded himself in a classroom in a standoff with

 
A police school safety officer stands outside the New Millennium Business Academy Middle School in the Bronx, which was evacuated after a teacher barricaded himself in a classroom in a standoff with
A police school safety officer stands outside the New Millennium Business Academy Middle School in the Bronx, which was evacuated after a teacher barricaded himself in a classroom in a standoff with police, in New York April 24, 2009. The teacher surrendered to police after about three hours. REUTERS/Chip East (UNITED STATES CONFLICT SOCIETY)