NEW : Officer Oliver Smith , 30 , had built four homemade bombs , police chief says . NEW : Police think he pulled fire alarm , perhaps to draw people out of rooms , into open . NEW : Police put together information to find out who he planned to attack . NEW : He had few friends , had anger issues , chief says .
NEW : James Oliver Seevakumaran , 30 , had built four homemade bombs , police chief says . NEW : Police think he pulled fire alarm , perhaps to draw people out of rooms , into open . NEW : Authorities piecing together information to figure out who he planned to attack . NEW : He had few friends , had anger issues , chief says .