At least one person has died and dozens are injured in an explosion that tore through this sweet factory in northern Mexico.<br/> <br />Officials say the boiler exploded in the Dulces Blueberry factory at an industrial park in Ciudad Juarez near the U.S. border.<br/> <br />But some workers said the blast was caused by a gas leak.<br/> <br />(SOUNDBITE) (Spanish) UNIDENTIFIED FACTORY WORKER, SAYING:<br/> <br />"It was an explosion. (Reporter: What did you do in this factory?) We wait for the honey for the glucose. (Reporter: And what do you think happened?) I imagine a gas leak because the explosion was very strong. (Reporter: What do you remember? Did you see people injured?) Yes, many people bleeding, burnt. (Reporter: What happened to you?) It just hurt my heel."<br/> <br />About three hundred people were in the factory when the ceiling collapsed. Six of the injured are in a serious condition but several people are still missing.<br/> <br />Fire services and about 30 ambulances arrived at the scene to treat the
