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PLAINFIELD, Ind. (Jan. 4, 2016) — Students in Plainfield return to school Monday morning.

The district began its holiday break early after violent online threats targeted Plainfield High School. Police have yet to track down the person behind those threats, and that has some students and their parents fearful.

There will be extra officers at Plainfield High School, and every other school in the district, on Monday.

Sunday evening school officials sent an email to parents explaining that backpacks will not be allowed in the school until further notice (purses will be subject to searches).

The note then went on to say that at the high school, wands will be available to screen students as they enter the building. Students are asked to empty their pockets completely before coming to school. Here’s the email from the district:

Plainfield police, in conjunction with the FBI, are confident that the threats against our schools are not credible. However, to ensure the safety of students and teachers, we are taking additional security measures. Because of the complexity of Internet crimes, the resolution could take some time.

At the high school, wands will be available to screen students as they enter the building. Backpacks will not be allowed until further notice. Purses will be subject to searches.

High School students:  know that your pockets must be empty when you when you enter the building. This includes cell phones, change and keys.

We greatly appreciate your patience as we work through this situation. Again, law enforcement officials are confident that these threats are not credible. ​

The violent threats first surfaced nearly three weeks ago, and the person behind them posted as recently as this weekend. Plainfield High School was the target initially.

The district decided to close all its schools on Dec. 17.

The very next day the Shops at Perry Crossing were mentioned in a threatening post that caused officials to evacuate the entire mall. Police believe the same person is behind both threats.

Investigators haven’t identified that individual, but tell FOX59 they are following up on all tips related to these cases. Plainfield police officers will be working alongside Plainfield school officials Monday to make sure that students feel safe.

“We are all working together to make sure that we are creating the safe environment for the school. I think that you will see that on Monday morning that the schools are going to be safer than they can or ever have been in the town of Plainfield,” said Captain Jill Lees with the Plainfield Police Department.

Police say the same person targeted Danville High School last month, and forced the district to cancel classes on Dec. 17 as well.

All Danville Community Schools will have extra security as students return to school from winter break on Monday.