Updated at 8 p.m. to include individuals and charges they face.

Fifteen men have been arrested in Collin County after a weeklong investigation revealed they were involved with online child exploitation, police said Monday.

The charges range from promotion of child pornography to online solicitation of a minor, according to the Collin County Sheriff’s Office. Investigators with Operation Medusa seized hard drives and other electronic devices used in the crimes, which may reveal other offenders who may also be arrested, police said.

Multiple local agencies were involved in the investigation.

From left to right, top to bottom: Richard Butterly, Richard Coccaro, Julien Duhec, Scot Eenigenburg, Jason Gyorfi, Roberto Hernandez, Thomas Higgins, Rick Huss, Kirk Martinez, Daniel Mclean, Eric Montalvo, Philipjohn Ramkissoon, Christopher Reddick, Deryl Reed and Gustavo Villalobos.

Those arrested included: