Gunman shot self as 1st responders closed in

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Connecticut's governor says the elementary school gunman committed suicide when he heard first responders coming.

Gov. Dannel Malloy's comments Sunday on ABC's "This Week" raise the possibility that Adam Lanza had planned an even larger, more gruesome massacre.

Malloy also says that the gunman blasted his way into the building Friday to carry out the deadliest massacre on school-age children in U.S. history.

Lanza used a high-power rifle to kill 20 children and six adults, including the principal who died trying to stop him.

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