A trio of Israeli filmmakers remains arrested in Nigeria for the past week while the reason for their detainment and the charges have not been released.

Israel’s Foreign Ministry confirmed to The Jerusalem Post the arrests of Columbia University graduate Rudy Rochman, who founded the university’s Students Supporting Israel group, Andrew (Noam) Leibman and Edouard David Benny. The group was shooting a documentary in Nigeria about obscure Jewish communities when they were arrested on July 9, their family said in a statement.

The group had been working for more than a year on a documentary titled “We Were Never Lost” about lesser-known Jewish communities around the world. On July 7, they visited the Igbo community, a Jewish group that considers themselves one of the lost tribes of Israel, and presented Igbo King Eze Chukwuemeka Eri with a Torah scroll, which Rochman posted about on social media.

“This documentary is not intended to make any political statements about the countries in which filming will take place, nor does the filmmaking team endorse any political movements,” the statement added. “The filmmaking crew acts as a guest visiting the country and its various communities—there are no political overtones.”

Relatives of the filmmakers said they are working with the embassies of the United States, France and Israel.