That was fire chief Marty Senterfitt-- he says, witnessing smeone's death is traumatizing for everyone... even the men and women who respond to these dangerous situations for a living. Three children were killed-- the oldest ... was just 4-years-old. Their grandmother was killed as well. Right now, a memorial has been building outside the chidlren's Oceanway home. Teddy bears and signs that read: "R-I-P, God's Little Angels." We know the fire happened just before 6 last night. Investigators believe it started in a bedroom. It took crews just 4-minutes to get there... but even then, it was too late. The short amount of time it took for the home to catch fire ... is one reason why experts say mobile homes can be dangerous. Channel 4's Heather Leigh is taking a look at those dangers. But first-- Tarik Minor talked to a firefighter who was at the scene. Tarik, how are these responders doing? 3 3 3 3 Firefighters will tell you they haven't been able to internally process the deaths of 3 children and their grandmother. Most times they're successful in rescueing people from the flames, but in this case, they didn't even get the chance because the flames were so intense. 3 00 12-16115-119Even the most seasoned firefighters found themselves fighting back tears and asking why.. 3 children, ages 2, 4 and 10 months old, and their grandmother - all perished in the flames. 08:02:35"you could tell that most of the individuals on the scene,looked like they had been punched in the gut pretty hard, cause they were just ohh gosh, we can't do this...let it breathe."District Chief Robin Gainey says it's one of the toughest scenes he's responded to in his 30 year career.Fire fighters pulled out the 2 year old first, then the 4 year old and 10 month old, and then their 53 year old grandmother.Gainey says it's hard to believe so many people died in such a short period of time, making all 40 firefighters, think of their loved ones at home." 08:09:34"i thought it was interesting that everybody, all the initial crews that were there , everyone of them, called their house and said, I just called my house to make sure everyone is ok there, and that to me, that's just them reassuring themselves that is still normalcy." 07:47:07"too often people forget the men and women who wear this uniform are human, they have their own children and so when we get a structure fire and literally pull burned children out of the house, it's traumatizing."Chief Martin Senterfitt says his firefighters were visibly shaken but still they wanted to continued working through the night. The chief says in the days and weeks ahead, each fire fighter will get the care and attention they need. 07:49:25"Last night was so tragic, so graphic and it was still in the daylight hours, so every time you bring somone out, the evidence is right in front of you, and the firefighters are having to physical deal with this, and it's overwhelming." 3 Tarik... no doubt the responding firefighters are second-guessing their own actions... Could we have done more to help save the family? .. What are their superiors saying to them about that?