Authorities in Cass County say the second threat against the Plattsmouth Community Schools that prompted the cancellation of classes Wednesday does not appear to be credible. The investigation continues.

All classes were shut down Wednesday to allow law enforcement time to take a closer look at the threat. The Sheriff's Department told our sister-station WOWT 6 News they don't believe that threat was valid.

The school district put out the following message earlier Wednesday.

"This is a reminder that there are no classes or activities at the Plattsmouth Community Schools, on Wed., Feb. 21.

"We received information that some individuals did not receive Infinite Campus messages. We apologize if you did not receive the messages. We are working to resolve the issue and prevent that from happening in the future.

PCS plans to release an additional statement by late afternoon or early evening, after communicating with law enforcement and the information is available for Thursday."

In the case of the first threat, two teens were questioned by the Sheriff's Department after authorities received information investigators deemed a credible threat.

In a joint news release, the Sheriff’s Office and the Plattsmouth High School administration revealed that two male students, ages 15 and 16, were developing “terroristic plans" but had not yet acted.

The teens, with their parents, have been interviewed regarding the threats. Officials said the weapon that the teens had intended to use has been accounted for and has been secured. Detectives searched personal property but officials said no additional evidence was found.

The two students are in the custody of their parents and have been banned from school grounds.

On the heels of that investigation, officials said they received information regarding the second threat against PCS Tuesday evening. "In an effort to allow law enforcement adequate time to investigate the threat no classes will be held Wednesday."

While the investigation continues, parents are raising questions. Donna Merrill said, "It's like, what time did they find this all out? And then we find out at almost 9 o'clock at night. Or actually, 8 o'clock when the email went out and on Facebook."

School officials, the Cass County Sheriff’s Office and the Cass County Attorney’s Office have been working together on the case. Investigators are still interviewing students who have direct knowledge of the allegations. Anyone with additional information should call Cass County Sheriff’s Office at 402-296-9370.

The Plattsmouth Community School District notes on its website that the district is in the process of reviewing its safety and security plan in the aftermath of recent incidents elsewhere.

A statement on the site reads as follows:

"In light of recent school shootings, there has been much discussion about safety and security at schools throughout the nation. At the Plattsmouth Community Schools, we have a safety and security plan that was developed with the assistance of a renowned safety and security expert.

"All buildings have safety and security protocols for emergency situations, including intruders. Along with local law enforcement, members of our district safety team are in the process of reviewing our safety and security plan relative to intruders, in an effort to ensure the safety of our students and staff members on all campuses.

"If you have questions about safety and security at a specific location, please contact the building principal. Thank you for your support of the Plattsmouth Community Schools."

THE FOLLOWING IS A JOINT PRESS RELEASE FROM THE CASS COUNTY SHERFF'S OFFICE AND THE PLATTSMOUTH COMMUNITY SCHOOL... Posted by Cass County Sheriff's Office - NE on Tuesday, February 20, 2018