"The protesters took over several cities, while police tried to quell protests and get hundreds of students and teachers out of the streets."
http://www.insidecostarica.com/dailynews/2011/april/13/centralamerica11041302.htm
Teachers had just returned to work after a strike in protest of new education law imposed by the military junta which deposed Zelaya.
http://www.miamiherald.com/2011/04/01/2144511/teachers-strike-fuels-unrest-in.html