The Transportation Security Administration is considering implementing additional security measures for airport and airline employees, including enhanced airline-employee screenings, random security checks and additional TSA and law enforcement patrols in secure areas, said federal officials in a statement Thursday.

The Chicago murder rate dropped to the lowest it has been since 1965, but city officials aren't fully satisfied. Shootings were also down by about 24 percent, and reports of overall crime have dropped by about 16 percent. However, Chicago’s 2013 death toll remains higher than those in New York and Los Angeles.

It costs more than $2 billion every year in hospital charges to treat victims of firearms-related injuries, according to a study released at the annual meeting of the American Public Health Association (APHA).

A new study from the American Journal of Public Heath shows that U.S. states with higher estimated rates of gun ownership experience a higher number of firearms-related homicides.

Answering a ring at the door, Tom Clements was shot and killed. The suspect and motives are still under investigation.

The contentious proposal to reinstate the assault weapons ban has been postponed, but measures to extend background checks to private gun sales and fund school security improvements have been voted through to the Senate. 

States with more gun-control legislation, such as Massachusetts, New Jersey and Connecticut, have lower rates of gun-related deaths than states with fewer gun-control laws. 

Renewing the assault weapons ban is only one of multiple proposals and 23 executive actions laid out by President Obama in response to the Newtown massacre. 

The U.S. outpaces other wealthy countries in violent deaths, as well as in shorter life expectancy overall.