Happening now, police reveal the Texas School gunman was not

confronted by anybody before he entered the building through an apparently

unlocked door and remained inside for about an hour until he was killed.

Authorities facing growing questions and criticism over their response to the massacre. New video shows frantic parents being held back by police during the shooting,

pleading for action as they heard shots ring out.

One victim's father says he and others wanted to storm the school to quote

get our babies out. Our correspondence are covering every angle of this story

including our CNN teams on the ground in Texas. We want to welcome our

viewers here in the United States and around the world. I'm Wolf Blitzer,

you're in the situation room. Tonight there's growing evidence that it was all too easy for a gunman to walk into

a Texas elementary school unobstructed without anyone

initially trying to stop him.

See in a national correspondent, Jason Carroll is on the scene for us.

Jason, police revealed alarming new details.

As you well know, as they face very serious questions

right now about their response to the massacre.

Yes, Wolf, and as you know, a lot of details that authorities still have to clarify out here,

especially after they gave out that bad information about who had initially responded to the shooting.

All this, as parents out here in this community, are still frustrated, they're still very, very

angry, and looking for answers as to why it took more than an hour to take down the shooter.

Tonight CNN has obtained video showing frantic parents gathered beyond the police

line while the shooter was inside their children's school.

...