The Motion Picture Association of America is changing its rating system to better inform parents about violence in movies.

CEO Christopher Dodd announced the tweaks in Las Vegas Tuesday at the annual movie-theater convention, CinemaCon.

The White House has called on the movie industry to give parents better tools to monitor violence in media since the Newtown, Conn., school shooting.

Dodd did not address the shooting directly but spoke generally about the need to help parents control what their kids see.

The new ratings system will include descriptions about why a movie received its ratings.

For example, the rating might cite “strong carnage” or “war violence.”

Prosecutors say a Wisconsin man who has admitted he killed his three young daughters was in control of his actions and decided that a “selfish desire for revenge” was worth more than his girls’ lives.

Jurors are weighing whether Aaron Schaffhausen was legally sane when he killed 11-year-old Amara, 8-year-old Sophie and 5-year-old Cecilia in their River Falls home last July.

During closing arguments Tuesday, prosecutor Gary Freyberg told jurors that Schaffhausen was in control of his actions, and that he is a mean, callous person — but not legally insane.

Defense attorney John Kucinski said earlier that Schaffhausen has a rare mental disorder, rooted in a deep dependency on his wife.

Schaffhausen has pleaded guilty to three counts of first-degree intentional homicide, but he maintains he’s not responsible.

The director of the Omaha Marathon says the bombing in Boston will make her more vigilant about security, but she doubts it will diminish the popularity of marathons.

Director Susie Smisek said Tuesday security for the Omaha race generally has been focused on keeping runners safe from vehicle traffic. She said other security threats will now get more scrutiny when the marathon is held Sept. 22.

Smisek said it will be important to “watch out for something that might not look right.”

Smisek said marathons have increased in popularity in recent years because more people are health conscious.

She said Boston will continue to be on runners’ minds for a while but that participation in marathons probably won’t decline.

The next marathon in Nebraska is May 5 in Lincoln.

Doctors say they removed a host of sharp objects from children and adults injured by the Boston Marathon explosions.

A doctor at Boston Children’s Hospital said they removed BB pellets and nails from children. Dr. David Mooney says there were nails sticking out of one little girl’s body.

Two children remain in critical condition at the hospital with serious leg injuries. Mooney said that tourniquets applied by emergency responders at the race saved the children’s lives.

More than 170 people were hurt by the blasts. Doctors at Massachusetts General Hospital also say they removed metal fragments from victims of the bombs.

Hospitals began releasing more information Tuesday about the victims’ injuries, including broken bones, amputated limbs and head injuries.

An 18-year-old has been given 30 to 35 years in prison for fatally shooting another young Lincoln man.

Zachary Neuberger pleaded no contest to manslaughter and a weapons charge after prosecutors lowered the charges. Neuberger was sentenced on Monday in Lancaster County District Court.

Prosecutors say Neuberger used a shotgun to shoot 19-year-old Naif Al-Kazahy during a late-night brawl in July.

Two other men were charged as accessories in the fight, which involved several people.

Nebraska officials are trying to determine the best course in securing the future of a 10-year-old boy who cared for his fatally injured father at their Lincoln home.

Young Peter Asumani was taken into state protective custody on March 1. He told a police investigator that his father, 45-year-old Bienvenu Asumani, had fallen and struck his head. Peter said he couldn’t communicate with his father but fed him and gave him liquids for more than a week.

Bienvenu Asumani died two days after a policewoman discovered the situation. She’d gone to Peter’s home to check on his school absences.

The Lincoln Journal Star says relatives in Connecticut are trying to gain custody of Peter.

Nebraska officials say they can’t comment on Peter’s case.

Nebraska’s veterans’ home in Norfolk received a perfect score on an annual U.S. Department of Veterans Affairs health care survey.

The state’s Department of Health and Human Services announced Monday that the home received the highest score for the second year in a row. The department runs the home.

A team of nurses, dietitians and a life safety code expert evaluated the environment of the facility, and the level of care and services the veterans receive. The evaluators say the facility had no deficiencies.

The facility’s administrator Jerry Eisenhauer says support from staff, service organizations and volunteers helps maintain consistently high standards of care at the veterans’ home.

The Nebraska Department of Health and Human Services also has veterans’ facilities in Bellevue, Norfolk, Grand Island and Scottsbluff.

The second suspect in an Omaha slaying has surrendered.

Twenty-two-year-old Devaughn Griffin Sr. surrendered at police headquarters on Monday morning.

He and 22-year-old LaMichael Fewell are charged with fatally shooting 23-year-old Jer’ray Moore on April 6 at an apartment complex in central Omaha.

Griffin and Fewell remained in Douglas County Jail on Tuesday. Online court records don’t list the names of their attorneys.

An explosion at the finish line of the Boston Marathon Monday killed three people and injured dozens more. Here’s an at-a-glance look at the facts in the case:

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THE EXPLOSIONS

Two bombs exploded about 10 seconds and 100 yards apart at about 2:50 p.m. Monday in Boston’s Copley Square, near the finish line of the Boston Marathon. Three people were killed, including an 8-year-old boy, and more than 140 were injured. The explosions occurred four hours into the race and two hours after the winners had crossed the finish line, but thousands of runners were still on the course.

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THE INVESTIGATION

The FBI took charge of the investigation into the bombings, serving a warrant late Monday on an apartment in the suburban Boston town of Revere and appealing for any video, audio and still images taken by marathon spectators. No arrests had been made, and authorities weren’t commenting about suspects.

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PRESIDENTIAL RESPONSE

President Barack Obama vowed that those responsible will “feel the full weight of justice.” The president was careful not to use the words “terrorism” or “terrorist attack” in his remarks, but a White House official, speaking on condition of anonymity because the investigation was still unfolding, said the attack was being treated as an act of terrorism.

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SECURITY RESPONSE

The area around Copley Square remained closed Tuesday morning, as did exit ramps from major highways to the area. The Federal Aviation Administration barred low-flying aircraft within 3.5 miles of the site. Other cities also beefed up security in response to the bombing and the Secret Service expanded its security perimeter around the White House.