A Florida woman has been arrested and charged with four counts of first-degree solicitation to commit murder, the Pitt County Sheriff’s Office reported Monday.

Leticia M. Silva, 31, of Lakeland, Fla., is accused of contacting her children in December and asking them to kill their grandparents. The grandparents live in Pitt County and have permanent custody of the children.

Silva reportedly mailed the children a knife to commit the murders, a news release stated.

The grandparents learned about the communication and on Feb. 4 the sheriff’s office began an investigation.

Silva turned herself in Monday and currently is being held in the Pitt County Detention Center under a $5 million secured bond.