Deaths from IHOP shooting "hit real hard"

Another of the people shot at the IHOP restaurant in Nevada Tuesday has died. That brings the death toll to five, including the gunman, who took his own life. CBS News correspondent Bill Whitaker in Carson City has learned more about him.

Nevada National Guard member Miranda McElhiney died of her wounds late Tuesday. Also killed were National Guards members Heath Kelly and Christian Riege, and civilian Florence Gunderson.

"In a few short hours, we lost the same number of soldiers we lost in the entirety of Operations Iraqi and Enduring Freedom, so it hit real hard," said Brig. Gen. Bill Burks of the Nevada National Guard.

The blow was delivered by 32-year-old Eduardo Sencion, who had no prior criminal history, but was committed to a mental hospital by police in 2000.

"His family has indicated that there is a history of mental illness that is continuing to be investigated," said Carson City Sheriff Ken Furlong.

IHOP shooting death toll rises to 5
Man opens fire at Nev. IHOP, at least 5 dead
IHOP gunman Eduardo Sencion had mental issues, says family

Sencion pulled into the IHOP parking lot Tuesday morning and immediately opened fire with an assault rifle. He walked toward a table at the rear where five National Guard members were eating breakfast.

Dozens of frantic 911 calls describe the panic.

Caller: "Now he's coming back out with a gun. He's hitting people in the parking lot. He's got an automatic weapon."

"Ryan! MOVE!" the caller continued, as gunshots could be heard. "He's shooting at us now!"

Police say Sencion, who worked at his family's grocery store, left no notes behind. They doubt he was targeting National Guard members.

"While numerous Guardsmen were obviously attacked," said Furlong, "an equal number of civilians were similarly assaulted."

A pistol and another assault rifle were found in Sencion's van.

The IHOP restaurant remains a crime scene. The governor of Nevada has ordered flags flown at half-staff to honor of the slain Guard members. Late Tuesday, the Nevada National Guard ordered members not to wear their uniforms off base as a security precaution.

After the report, CBS Evening News anchor Scott Pelley asked Whitaker if there were any clues to why Sencion did the shooting.

"We do know that he filed for bankruptcy back in 2009," said Whitaker, "but his family says he was no longer troubled by that. In fact, they say he didn't seem troubled at all, that he seems to have just snapped."