The U.S. military says it could take several weeks to determine what caused a Marine Corps jet to crash into a San Diego neighborhood, Monday.
Four people, all in one house, were killed. The man who lost his entire family says he is relying on God to make it through this tragedy.
"I believe my wife, and two babies and mother-in-law are in Heaven with God," Dong Yun Yoon said.
Yoon was at work when an F/A-18D military jet crashed on its way to the Marine Corps Air Station Miramar, leaving a pile of burning rubble where his home once stood.
His wife Young Mi, their two daughters 15-month-old Grace and 2-month-old Rachel, and his mother-in-law who was visiting from Korea to help his wife care for their new baby, were all killed in the accident.
Michael Rose, a neighbor who saw Yoon leaving for work that tragic day, said they were the picture of a happy family.
"It just seemed like a dad starting his day, kissing his family goodbye," he said. "I thought what a beautiful scene I just saw and then later in the day boom, they're gone."
The family was active at the Korean United Methodist Church in San Diego.
Yoon emigrated from Korea almost 20 years ago, learning English and becoming a U.S. citizen.
He now worries about what to say to family members back home.," he said.
"My father-in-law is coming tomorrow and I don't know what to tell him, I don't know if he will ever forgive me
But faith is helping him forgive.
He said he does not blame the pilot who safely ejected before the crash.
"I don't have any hard feelings, I know he did everything he could," Yoon said. "Please pray for him not to suffer from this accident."
A California congressman is calling on the military to release the maintenance records of all fighter jets like the one that crashed.