BAMAKO, Mali — Defying the Algerian army’s demands to give up, the band of Islamist militant kidnappers who terrorized a remote natural gas field still held at least 10 and possibly dozens of foreign hostages Friday, and a senior Algerian government official said there were no talks planned to end the standoff.

‘‘They are being told to surrender, that’s it,’’ said the official on the third day of the crisis. ‘‘No negotiations. That is a doctrine with us.’’