A group of volunteer firefighters were arrested Monday night in connection with an alleged sexual assault.

A man — whose identity was not released because he is a sexual assault victim — filed the complaint March 31, stating that five fellow firefighters held him down at the Emergency Service District No. 6 fire station, pulled his pants down and, while laughing and yelling, sexually assaulted him multiple times with multiple instruments on Jan. 20.

The allegation is outlined in graphic detail in the link below.

• WARNING: Graphic Account of Firefighter's Sexual Assault

Texas Department of Public Safety Sgt. Lonny Haschel said 26-year-old Keith Wisakowsky, 30-year-old Casey Stafford, 19-year-old Preston Peyrot, 28-year-old Alec Miller and 19-year-old Blake Tucker were arrested and charged with aggravated sexual assault.

A sixth person, 23-year-old Brittany Leanne Parten, recorded the incident and was arrested for improper photography, according to Haschel.

Top row ,left-right: Alec Miller, Casey Stafford, Blake Tucker.

Bottom row, left-right: Preston Peyrot, Brittany Leanne Parten and Keith Wisakowsky.

The affidavit stated that all those arrested could be seen and heard yelling and laughing during the incident.

Online jail records show at 4:30 p.m. that five of the six accused had been released; Stafford remained in custody, held on $75,000 bond.

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According to The Associated Press, the department's Facebook page listed Miller as 2014 officer of the year.

Authorities said the Texas Rangers are investigating the incident.

Ellis County Judge Carol Bush released the following statement regarding the incident:

DV.load("//www.documentcloud.org/documents/1744403-judge-statement-04-07-15.js", { width: 650, height: 800, sidebar: false, container: "#DV-viewer-1744403-judge-statement-04-07-15" }); Judge Statement, 04 07 15 (PDF)

NBC 5's Ellen Bryan, Frank Heinz and Jocelyn Lockwood contributed to this report.