. >>> houston, hazmat teams trying to clean up a mess after a fire at a kplem cal warehouse. explosions and toxic flames, shelter in place. nbc janet shanly has more. >> explosions, amid a massive fire, rocking houston. >> a bomb, it's like a bomb. >> starting in a hope, the blaze quickly engulfed the industrial building. inside, ammunition and drums of chemicals that blew up like fire works. with billowing smoke, filling hazardous material in the air, authorities sent out a shelter in place. urged to close windows and stay inside. more than 600 students evacuated from a nearby elementary school. it was a 4 alarm with 200 firefighters on the frontline. >> that thing flew over and we just felt the heat. >> the smoldering aftermath looking like a battle zone. a miracle no one was hurt. >>> officials are trying to determine what chemical exploded, meanwhile, residents told to avoid runoff from the fire. >>> well, spacex successfully launched a rocket overnight from cape canaveral, florida. japanese communications satellite into orbit. the rocket also successfully landed in the a