Three civil liberties organizations are accusing the Fort Worth Police Department of “unconstitutional censorship” and demand that police return the photos seized from a local museum last month as part of a child pornography investigation.

A trio of civil liberty organizations are asking the Fort Worth Police Department to return photographs confiscated last month from an exhibit at the Modern Art Museum of Fort Worth, according to a Wednesday letter addressed to the police chief.

Police in Fort Worth, Texas, seized photographs from an art exhibit in November after local politicians decried the images as pornographic. The photos, from artist Sally Mann's 1992 collection Immediate Family depict intimate details of Mann's family life,