-- For the second time in about a week, a string of bomb threats interrupted classes at schools around Bergen County Friday, officials said.

Englewood, Paramus Catholic, Teaneck, Cliffside Park, Ramsey, Mahwah, Waldwick, Hackensack, Fort Lee and Oradell schools received threats, according to the Bergen County Sheriff's Office and local police. All the high schools were checked and deemed safe as of around 1:15 p.m.

In Passaic County, officials were also called to threats at Manchester Regional High School in Haledon and Passaic Valley High School in Little Falls, officials said.

"Non-credible threat this morning. School sheltered in place," the Passaic Valley School Superintendent's Office said on Twitter. "All protocols followed."

Authorities also confirmed Nutley High School received a threat late Friday morning. Police responded to the round of hoax threats around 11 a.m. and reported finding nothing dangerous. The investigation was ongoing.

Officials ordered a "shelter in place relaxed lockdown" at the Waldwick middle and high school, the borough said on Twitter. All students were safe.

The Oradell Office of Emergency Management said River Dell High School was deemed safe after the threat and students were allowed back to class.

Last Friday, a string of threats forced evacuations at schools around the county. Nothing harmful was found after police searched the schools.

In January, 26 schools across North Jersey also received threats. In those incidents, authorities said the threats came from an automated call.

The Fort Lee High School in addition to several other New Jersey schools has received a bomb threat. The Superintendent... Posted by Fort Lee Police Department on Friday, March 4, 2016

Bomb threats-Teaneck & Waldwick Schools have been cleared.... — B.C. Sheriff's Ofc. (@BergenCountySo) March 4, 2016

Bomb Threats-Englewood, Paramus Catholic,Teaneck ,Cliffside Park,Mahwah,Waldwick,Hackensack,Fort Lee, and Oradell. Stay clear pend. search.. — B.C. Sheriff's Ofc. (@BergenCountySo) March 4, 2016

Only Hackensack can manage weekly bomb threats. — Ryan (@ChaosShadow98) March 4, 2016

HHS is always having bomb threats. — Erica Kane (@Alwaysmiaa_) March 4, 2016

Waldwick MS/HS in shelter in place relaxed lockdown. @WaldwickPD are investigating suspicious phone call. All students and staff are safe. — Borough of Waldwick (@BoroughWaldwick) March 4, 2016

Noah Cohen may be reached at ncohen@njadvancemedia.com. Follow him on Twitter @noahyc. Find NJ.com on Facebook.