Authorities have released an official list of those killed in the shooting rampage at a Texas church.

The gunman who killed 26 people at a small-town Texas church went aisle to aisle looking for victims and shot crying babies at point-blank range, a couple who survived the attack said.

The gunman who slaughtered 26 people at a Texas church appeared to target babies who cried and others who screamed or made noise, according to a couple who were at the service.

Latest: A connection has emerged between the gunman and a Texas church where 26 people were killed as police described the victims as "defenceless people".

Latest: A man opened fire inside a church in a small South Texas community on Sunday, killing more than 20 people, including children, and wounding at least 20 others.