'Nightline' Daily Line, Dec. 21: Protestors Interrupt NRA Presser

5:19 p.m. ET: In the spirit of the holidays we dusted off a Christmas-themed Platelist. Famed TV chef Nigella Lawson shared some of her favorite recipes when her "Nigella Christmas" cookbook debuted. Watch it HERE:

3:27 p.m. ET: Aliens in Mexico?

Archaeologists in Mexico have uncovered 25 "alien"-looking human skulls with in a cemetery in the northwest state of Sonora, they said today.

Some of the skulls showed "deformities," said Cristina Garcia Moreno, who worked on the excavation project with Arizona State University, which analyzed the bones.

Read the full story HERE

1:11 p.m. ET: WATCH: NRA President Wayne LaPierre was interrupted twice by protestors during his press conference, who stood in front of his podium holding signs and shouting that the NRA "has blood on its hands" and that the NRA is "killing our kids." The protestors were eventually escorted out of the room.

Watch what happened HERE:

12:13 p.m. ET: The National Rifle Association stood its ground today in arguing that the answer to gun violence in schools is an armed security force that can protect students, while blaming the media and violent entertainment and video games for recent deadly shootings.

"The only thing that can stop a bad guy with a gun is a good guy with a gun," NRA executive vice president Wayne LaPierre said in presenting the NRA's first comments about the Connecticut school shooting since it occurred a week ago today.

Read the full story HERE

Credit: ABC News

11:01 a.m. ET: "A Day in the Life of the American Gun": "Nightline" last night devoted the entire show to a special report about guns in America. With a team of correspondents fanned out across the country, we took a thoughtful look at how guns are used, abused and loved.

Watch our full episode HERE

9:30 a.m. ET: Sandy Hook Moment of Silence : Officials in Newtown, Conn., scheduled the event to recognize victims of the massacre that began at 9:30 a.m. Dec. 14, when gunman Adam Lanza shot his way into Sandy Hook elementary and launched a shooting spree at the school, taking 26 lives, including 20 children, and then his own.

Watch the special report of the moment of silence HERE: