"waited for about an hour..."

If this is accurate, then what, exactly, is the point of calling 911?

The attack came just after 10 a.m. at the American Civic Association, an organization that helps immigrants settle in this country...One receptionist was killed, while the other, shot in the abdomen, pretended to be dead and then crawled under a desk and called 911, he said.

Police said they arrived within two minutes.

...

Police heard no gunfire after they arrived but waited for about an hour before entering the building to make sure it was safe for officers. They then spent two hours searching the building.

Seriously. That can't be right, can it?