NYTimes wrote:
At Okawa Elementary, another issue is trust.
Parents are frustrated at the lack of an explanation for its tragedy, when other schools nearby were also heavily damaged but had no deaths. A month after the disaster, relatives of the deceased still gather near the city's wreckage to mourn and peer into trucks that drive by with recovered bodies to check for their children.
According to city and school officials, teachers told students to get under their desks when the earthquake hit, then led them outside to the playground, as they had been trained. The next step was to seek higher ground, but fallen trees blocked the way up a steep mountain, so after debating for several minutes they started heading toward an elevated bridge a short distance away.

http://www.nytimes.com/aponline/2011/04/13/world/asia/AP-AS-Japan-Earthquake-Schools.html?ref=global-home