SPOKANE VALLEY, Wash. -

A substitute teacher at Trent Elementary has been arrested after allegedly assaulting three students. 

The Spokane County Sheriff's Office arrested 46-year-old Matthew C. Deryan. At least three sixth grade students say the teacher verbally and physically assaulted them. 

Sixth grade students at Trent Elementary came home Thursday with a note from the principal detailing what happened. The note said a substitute teacher "lost control" and "put his hands on one or more of our students."

Many of the students are upset about what happened, according to the note. A sixth grader who witnessed the incident said the teacher assigned the group an assignment and at some point afterward he locked the door and then hit a kid and punched another one.

The Spokane County sheriff's office charged Deryan with three counts of fourth-degree assault and three counts of unlawful imprisonment. The sheriff's office says more charges are expected as the investigation continues. There are allegations the teacher smelled of alcohol, used profanities and made physical contract with students.

The East Valley School District says they will have extra security at the school Friday as well as counselors on hand to talk to kids about what happened.

Full letter from Trent Elementary School:

Emergency Situation this afternoon:  It appears that this afternoon a substitute teacher in one of our classrooms put his hands on students and did other inappropriate things.  The Spokane Valley Sheriff is continuing the investigation on Friday morning.  If your sixth-grader was treated inappropriately or he or she saw the teacher's actions please help him or her write their recollections down and bring them to school on Friday morning.