The Newburgh School District explanation for the closure of the district on Friday, from the district homepage:

POSTED: Thurs., Jan 13, 2010
***Important District Information***

In response to an incident in the City of Newburgh last night the Newburgh Enlarged City School District will be cancelling all after school activities for today, Thurs., January 14, 2010. At this time, NECSD officials are working in conjunction with the City of Newburgh Police Department to ensure the safety and well being of all NECSD students and staff. The safety of our students and staff remains the top priority.

In addition, the NECSD will be closed tomorrow, Fri., January 15, 2010 in an effort to keep the unrest within the City of Newburgh from filtering into the schools. This includes all after school activities and scheduled events. School will resume as scheduled on Tues., January 19, 2010 following the Martin Luther King Jr. holiday.

The post contained little information. There was more information in the New York Times.