

Twenty-six candles were lit on Dec. 14, 2013 by President Obama and First Lady Michelle Obama, to honor the 26 students and teachers killed at Sandy Hook Elementary School in Newtown, Connecticut, the year before. (AFP PHOTO / Saul LOEBSAUL LOEB/AFP/Getty Images)

There have been at least 44 school shootings on K-12 or college campuses in 24 states — an average of more than three a month — since the deadly 2012 attack at Sandy Hook Elementary School in Newtown, Conn., according to a new analysis. Twenty-eight people have died and 37 have been injured.

Twenty children and six adults working at Sandy Hook were killed in the December 2012 assault in Newtown, leading to renewed calls around the nation for Congress to take action to prevent more gun violence. Legislators did nothing. Shannon Watts, founder of Moms Demand Action for Gun Sense in America, which did the analysis along with the national organization called Mayors Against Illegal Guns, said in a statement:

“Parents in communities across the country live in fear. An estimated 90 percent of school districts have tightened security since Newtown – installing metal detectors, surveillance cameras, and bullet-proof glass. Schools now routinely have lockdown drills reminiscent of Cold War air raid drills.”

Mayors Against Illegal Guns was co-founded in 2005 by then New York City Mayor Michael Bloomberg and then Boston Mayor Thomas Menino.

The analysis says: