Germany's foreign minister said one German citizen has been confirmed killed and another wounded in the attack at a beach resort in Tunisia, Deutsche Welle reported.

Frank-Walter Steinmeier said Saturday that many people who were reported missing have now been tracked down but added: "We cannot at this point entirely rule out a few more Germans being among the victims."

Steinmeier said that "attempts to knock Tunisia off its courageous path through terrorist attacks such as in Sousse ... will not and must not succeed."

German federal prosecutors said they opened an investigation into the resort attack. That was standard procedure because authorities in Germany are required by law to investigate the killing of any German citizen, at home or abroad.

A Tunisian security official has said that the attacker had concealed his weapons in a beach umbrella before he killed 38 people on Friday. The Islamic State group has claimed responsibility for the attack.