anne arundel police are warning you about bottle bombs. the latest happened monday when two teenagers threw a bottle bomb at a 6-year-old girl on a play ground in pasadena. don harrison is working the story. reporter: these bottle have become popular on youtube. in 2011, recount recount fire investigators d - anne arundel fire investigators have handled several cases. you can buy them at any store by themselves. they re fine. when you mix them together, not only is it dangerous but illegal. it s a felony in the state of maryland. it s the manufacturing of an explosive device. reporter: here s some evidence. you can still see some of the hydroclearic acid that was in the liquid. it s stupid. reporter: tyler riley knows the kids involved when the two threw a bottle bomb at a 6-year-old goirl girl. i think they should put them away for a little while. bail should be high. i think that s sick. reporter: i showed some youtube video and what can happen. why would