Concrete Flying News Today : Breaking News, Live Updates & Top Stories | Vimarsana

>> reporter: the powerful blast causing part of a building to collapse, sending chunks of concrete flying, damaging cars in the parking lot. 15 people were injured, 1 critically. >> our primary responsibility right now is to our employees and to those impacted by this. >> that barely missed our gas. >> reporter: authorities say the explosion happened around 8:00 a.m. at this beechcraft facility in wichita after a nitrogen gas line ruptured. >> there is no health hazard, but if people are concerned about that venting, they can shelter in their homes. and they'll be fine. >> reporter: textron av...

So far, at least four people are dead. more than 50 are injured. dozens of homes are gone. the fire is about 75% contained right now. it's been burning for more than 12 hours. san bruno is just north of san francisco, only a few miles away from the san francisco international airport. explosion happened about 6:30 p.m. thursday evening. local time. the heat was so intense, it melted car tail lights. it sent chunks of concrete flying. pacific gas and electric says a gas transmission line, not the kind that goes to your house. this is the one that -- it's a bigger line. it ruptured, it caused th...