PLAINFIELD, Ind. -- Many parents decided to keep their kids home on Monday after another threat was posted online against Plainfield High School.
The school released a statement to its students Sunday evening, outlining new rules for Monday morning.
Students were checked with wands as they enter the building. Backpacks weren't allowed and purses were searched.
All high school students had to empty their pockets when they entered the building.
Additional officers were placed at the schools.
Police say the extra security will stay in place until further notice.
One parent told RTV6, "They didn't make me feel safe about it so I kept my kids home." Another parent said, "A ton of kids are missing," from class. The district did not release official attendance numbers Monday.
Despite the threats and the security, students were able to begin their day without an incident.
"I know parents are seeking out more information," Plainfield Police Department Captain Jill Lees said. "We just don't have a lot of that at this time. Because they're still actively investigating this and we don't have a suspect in custody or a genuine direction for where this is going. We would really hope parents would speak to their children about the safety measures."
The district closed schools the day before Christmas break while police investigated the threats.
The person, posting on Facebook, said they would shoot anyone in the school.
PREVIOUS | Plainfield school threats involved pipe bombs, guns; suspect still sought | More threats made to Plainfield retailers Sunday evening | Plainfield mall opens after police give "all clear" from bomb threat
Even after classes were canceled, more posts appeared saying people would be "taken out" on Jan. 4 when students return.
"We're treating it very seriously," Plainfield Police Captain Jill Lees said.
So far, no arrests have been made.
"We're trying to create the safest educational environment for kids," Lees said.
Both the FBI and police say they don't believe the threats are credible.
The FBI doesn't want to jeopardize the investigation so no findings are being released at this time.
The RTV6 Master Guide to the Indy 500
You're going to the Indy 500 this weekend – and you think you know it all. But just in case … we've got the end-all,…
Two Hoosiers on the 'Route for the Brave'
Two Indiana men are walking across the country with a goal to help military members and their families.
Markleville PD building shelter for victims
A small Central Indiana community plans big steps to protect victims of domestic violence.
Former driver Randy Lewis finds success in wine
Randy Lewis got a late start as a driver in the Indianapolis 500.
Race day different this year for Sarah Fisher
Sarah Fisher has come a long way since 2000, when she drove as a 19-year-old in the Indianapolis 500 for the first time.