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An alarm clock and nails inside. those containers did not have a device that was able to detonate. that's why authorities believe that it did not go off. they also know that he had no criminal record, dimitri us, and authorities are offering no motive. as you said according to the fbi the number of injured rose from 10 to 13. three of those injured are in the hospital behind me, and two of them are in critical condition. chris? >> reporter: nbc's marian in a attention yo, thank ya -- tonight, some of them will be gathering for a baseball game. but coming up, we're going to hear from a survivor...

So it's on a very limited basis. as of right now, there's been approximately 50 that's come through there. >>reporter: much of it is a crime scene so they will not be able to access that part of the building. eight students and two teachers killed. the number of injured has risen from 10 to 13. 17-year-old dimitrius -- >> the latest we know is that the 17-year-old entered the high school with two handguns, that according to galveston county judge mark henry, as well as some home-made devices which included these carbon dioxide containers that were taped together with a pressure cooker,