Tunisian prime minister Habib Essid had said on Wednesday following the attack that tourists from Germany, Poland, Italy and Spain had been killed, but officials have since said that in fact, no Germans were dead.
Isis on Thursday claimed responsibility for an attack at Tunisia's Bardo Museum which left 20 foreign tourists dead, with the extremist group hailing the deadly shooting as a "blessed invasion".
The number of deaths resulting from the attack at the Bardo Museum where gunmen took tourists hostage was up to 23 as of Thursday afternoon.
German Chancellor Angela Merkel (CDU) offered her condolences for the victims on Thursday and pledged German support.
"We will do everything in our power to help Tunisia," Merkel said on Thursday in the German Parliament or Bundestag.