LOS ANGELES (KABC) -- Security for the Los Angeles Unified School District will be beefed up in the coming days following a threat against the district on Tuesday.
The FBI and local law enforcement have since deemed the threat not credible, but officials said they will increase security at the schools as a precaution.
MORE: LAUSD schools deemed safe after threat investigation
On Tuesday, law enforcement swept through and inspected 1,531 sites after the district received a threatening email that included specific threats against schools in the district.
The threat had both the implied threat of explosive devices and specific threats of an attack using assault rifles and machine pistols.
About 640,000 students were sent home as 2,780 officers inspected the schools.
LAUSD officials announced that campuses would reopen on Wednesday.
"All of us can go to bed tonight with a lot more comfort knowing that our schools have been checked and we have vetted the information," LAUSD Police Chief Steve Zipperman said.
Los Angeles Police Chief Charlie Beck said there will be a strong presence of uniformed officers around LAUSD schools.
"The safety of our children is the priority of this city. It is all of our priority," Beck said.
Zipperman said all officers at LAUSD will be in uniform the remainder of the week for high visibility.
He said officers in the district are usually not in uniform.
"We want to ensure the kids in this district, the parents, and the staff know that we're here to ensure that our presence is known and to reduce the fear and anxiety of all of our children that are returning back to school tomorrow so we can get the business of education underway," Zipperman said.
Officials said a similar threat was made against New York City schools. That threat was deemed not credible also.
MORE: NYC receives similar threat against schools
The threats come almost two weeks after the San Bernardino terrorist attack on Dec. 2 that claimed the lives of 14 people and injured 22 others.
LAUSD security to increase following threat