updated 5/5/2009 8:11:25 PM ET 2009-05-06T00:11:25

A high school student with ammunition and homemade explosives in his locker used a sawed-off shotgun to kill himself in a campus bathroom while classes were in session, forcing police to evacuate the school while they checked to see if the shooting was part of a more sinister plot.

After a gunshot rang out around lunchtime Tuesday, officers raced to the Canandaigua Academy, where students were being told over the intercom system to remain in their classrooms. The officers later evacuated the school in Canandaigua, a city of 11,000 residents just southeast of Rochester, taking the students to a nearby middle school.

The shooter, 17-year-old senior Thomas Kane, died of a self-inflicted gunshot wound, police Chief Jonathan Welch said. An investigation would determine if other students were involved, he said.

A search of Kane's locker revealed 30 rounds of ammunition and two Molotov cocktail-type devices made of bottles filled with liquid and corked with rags, police said.

At a news conference Tuesday evening, school district Superintendent Don Raw said no suicide note was found.

Authorities wouldn't comment on where Kane may have gotten the gun or how he got it into school. They said there was no indication of any plans to harm other students.

"This was not an assault on the school," district spokesman Andy Thomas said.

Two students found Kane's body in a boys' bathroom near the gym in the athletic wing shortly before 11 a.m.

Copyright 2009 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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