WASHINGTON (AP) - A new study shows that large numbers of District of Columbia school students could hear gunfire near their school buildings during the 2011-2012 school year.

The study released Wednesday by the Urban Institute examined District public and charter schools that are in areas covered by gunfire-detection technology. It found that 54 percent of those schools had at least one gunshot fired within 1,000 feet of the school during the year.

A handful of schools were close to a disproportionate amount of gun violence. Nearly half the gunfire occurred within 1,000 feet of just 9 percent of schools, and four schools had 9 to 11 incidents within 500 feet. Those four schools are in three different neighborhoods, including two in Columbia Heights in northwest Washington.

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