LAPD were on hand to assist in securing the school. (Creative Commons)

R.D. White Elementary School received an anonymous phone call around 8:30 a.m. warning that there was a bomb somewhere on campus, police Sgt. Tom Lorenz said. School officials immediately notified police and began evacuating students.

The school's 880 elementary schoolers were moved to the parking lot of a nearby Whole Foods Market as police and fire officials combed "every inch" of the school building, Lorenz told The Los Angeles Times.

Today was the first  day of classes after winter vacation and Lorenz said police have been visiting elementary and middle schools all over Los Angeles since the Sandy Hook Elementary School Shooting in Connecticut on December 14. The Los Angeles Police Department, L.A. County Sheriff's department and other law enforcement agencies have officers visting more than 500 public elementary and middle schools today, and will do so on a daily basis, the Los Angeles Times reported.

Elementary and middle schools had not been on LAPD's daily schedule before the shooting, but the Newtown, Conn. mass shooting prompted increased security at all public schools, not just high schools.

In addition to the existing 300 police and resource officers already stationed at L.A. Unified high schools, officers will now visit every elementary and middle school at least once a day at a random time.

Heightened school security is the new norm after the Newtown shooting. Schools across the United States are beefing up police presence and security measures on their campuses. Orange County, Fl. sheriff's deputies are working overtime this morning to visit about 60 elementary schools in unincorporated parts of the county, the Orlando Sentinel reported.

Elementary schools in Wisconsin began new security drills this morning, and started to close their entryways after the Newtown massacre. Maple Dale School in Milwaukee entered a new era of security protocols as its 300 students returned to school, according to the Journal Sentinel. Local police oversaw the school's first-ever lockdown drill. Public elementary schools in Chicago are working to train security personnel, increase video surveillance, and assigning over 150 uniformed police officers to schools in the area, the Lincoln Square Patch reported.

Inturder drills, locked doors and lockdowns are nothing new at many publich high schools across the country, but the Newtown shooting has upped the desire for such security measures at a larger amount of elementary schools.

Metal detectors are installed at some, but not all, L.A. middle schools, and L.A. Unified has not decided whether it will install them at the remaining schools, or at elementary schools, according to NBC.

The district is also offering grief counselors for parents, teachers and students after the Newtwon shooting.

Sandy Hook students returned to school about four days ago for the first time since the shooting, CNN reported. The students will be attending classes at a middle school in the nearby town of Monroe in a part of the building that was transformed to resemble their former elementary school. Security measures have been increased at all nearby schools, with more locks and cameras, according to Jim Agostine, superintendent of Monroe Public Schools.

And though schools across the country are heightening police presence and security measures, administrators say they do not want to drastically change the school environment and frighten their students, they just want to be prepared.

Read more about the Sandy Hook Elementary School shooting here.

Reach Executive Producer Brianna Sacks here.