Two villagers were shot and killed in the kidnapping, police confirmed yesterday.
The worker said he heard a man make the demand in a telephone call on Thursday to the site's supervisor. The caller warned him not to involve police or security forces, said the worker, who spoke on condition of anonymity because he was not authorized to speak to reporters.
Police special forces and a special investigative team for kidnappings have been searching around the village of Jenjela in the state of Kaduna, where gunmen on Wednesday abducted Professor Peter Breunig and his associate, Johannes Behringer, and walked with them into the bush.
The early Iron Age people are considered the earliest ancient civilization of the region that is now Nigeria, famous for their terracotta sculptures.
Two villagers accompanying the Germans were shot and killed in the kidnapping, police spokesman Aliyu Usman confirmed yesterday, adding that police were not aware of any ransom demand.
The kidnappers told police to keep away from them or "they will kill the German archaeologists," said Shehu Musa Tafa, chairman of the Kagarko local government area.
Nigeria's acting President Yemi Osinbajo summoned the federal police chief for a briefing Thursday on efforts to find the kidnap victims, the News Agency of Nigeria reported.
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