The final day of the Sago hearings wrapped up Thursday with many family members still frustrated and angry. Many family members say they still have questions left unanswered.
On Thursday state investigators said that they believe a bolt of lightning could have started the explosion. They also released findings about the air packs recovered from the accident scene. Tests on the air packs show that none of the devices had been used to their full capacity before being discarded by the trapped miners.
International Coal Group President Ben Hatfield says he and company officials voluntarily testified, and he hopes their information helped the families in some small way.
The state's final report on the cause of the Sago mine accident is not due until July 1st.