Public schools in the San Francisco Bay Area, New York City, Los Angeles, and Boston have experienced more than a quarter of all school shootings in the U.S. this year.

According to a report released by the National Safety Council, public schools in those areas have accounted for nearly a third of all schools-related shootings in this country since 2000.

The study analyzed the shooting deaths and injuries of students at more than 2,500 public schools nationwide between December 2015 and March 2016, using data from the Centers for Disease Control and Prevention.

The NSC also reviewed more than 4,000 school shootings that occurred during the same time period.

According to the report, nearly all public school shootings have involved a student who was a victim of bullying or abuse.

There were 1,542 school shootings involving students who were physically or sexually assaulted.

About 3,700 school shootings involved an adult student.

Nearly 2,000 were a result of a parent’s decision to take a child to a school, while about 1,400 were related to the school’s relationship with a mental health facility.

About 2,700 were the result of students who suffered from mental illness.

The remaining 1,700 shootings were the direct result of someone shooting or being shot at a teacher, student, parent, or staff member.

Nearly two-thirds of all shooting deaths involved students, and about 2,600 were the victims of guns, according to the study.

About 1,200 students were killed by teachers and students.

The majority of the school shootings occurred at public high schools.

A majority of students killed in the Bay Area were killed at public elementary schools, public middle schools, and high schools, while nearly a quarter occurred at charter schools, according the report.

More than 1,600 students were shot by students at charter school.

More than 6,600 school shootings took place in suburban districts, according a report published by the Umpqua Community College District in October 2016.

The district in New Hampshire, which is also home to several charter schools in New England, has seen more than 600 school shootings this year, according its report.

The most recent school shooting in New York, which occurred last week, left 10 students and three adults dead.

Teachers, students, staff members, and parents were killed in nearly 6,000 shooting incidents nationwide from January to March, according data from Umpquatch.com, a nonprofit website that aggregates and analyzes data.

Over a quarter (23 percent) of school shootings were in schools that were under-resourced, according, the report said.

In the Bay area, the number of schools that had fewer than 25 shootings was roughly half of all the schools, with two schools in San Mateo County alone, Marin County, and Sonoma County, accounting for 25 percent of the incidents.

The county has a total of 522 public schools.

“The fact that the vast majority of schools are underfunded is a serious problem,” said John D. Rizzo, an education researcher at the University of New Hampshire.

“The fact of the matter is that when the school has fewer than 15 students, that means they’re going to be in a position to shoot.”

The majority of public school shooting victims in San Francisco and the surrounding area were between the ages of 11 and 17.

More school shootings, including those that took place at public schools or charter schools were reported in the Los Angeles area, San Diego, San Jose, San Francisco, Santa Cruz, and Orange counties.

A total of more than 1.8 million students were enrolled in at least one public school in California between December 2014 and March 2015, according Umpqwn.com.

The report also noted that about 1.2 million students are enrolled in private or parochial schools in California.