(REUTERS) — Gunmen claiming to be from Nigeria’s Boko Haram Islamist group threatened on Monday to kill a kidnapped French family of seven if authorities in Nigeria and Cameroon do not release Muslim militants held there.

French ministers said they believed the three adults and four children seized in Cameroon’s far north near the Nigerian border on Tuesday were being held by Boko Haram which has killed hundreds to try to carve out an Islamist state in Nigeria.

The first sign of the family since they were captured came in a video posted on YouTube in which they appeared surrounded by three gunmen wearing turbans and dressed in camouflage.

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