SEATTLE-- The social worker who brought Josh Powell's two sons to their father's house in Graham Sunday she heard him tell the boys he had a surprise for them, according to ABC News.

I heard him say, 'Charlie, I've got a big surprise for you'... And then I heard Braden cry out, the woman told ABC News.

It's now known that Powell attacked the boys with a hatchet before lighting the house on fire using 10 gallons of gasoline, killing them and himself.

The social worker called 911 as soon as she said Powell took Charlie, 7, and Braden, 5, and slammed the door in her face. She told emergency dispatchers she could hear one of the boys crying, that she smelled gasoline, and that the boys may be in danger.

The woman also told ABC News she had been bringing the boys to Powell's house for court-ordered supervised visits for three months. Her husband told KING 5 News his wife was not afraid of Powell in the slightest.

A public memorial for Charlie and Braden will be held Saturday at 11:00 a.m. at Life Center Church in Tacoma.

To read the entire report from ABC News, click here.

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