Police say four Woodstock men are facing charges in an ongoing child pornography investigation.

Forty-six-year-old Ken Nichols and 29-year-old Cody McLay were arrested last year and each face several counts, including accessing and possessing child pornography.

Thirty-six-year-old John Kean was arrested last month and is charged with two counts of possessing child pornography and one count of accessing child pornography.

A fourth man -- who can't be identified -- was arrested last year and faces several child pornography counts, as well as sexual assault, sexual interference and invitation to sexual touching.