DAKAR, Senegal — Parents of girls who disappeared after their school in northern Nigeria was attacked by militants this week heckled state officials on Thursday and pummeled a motorcade after being told that, despite government reports to the contrary, their daughters had yet to be found.

“For three days he didn’t tell us the truth until now,” Modu Goniri, the father of two teenage girls who are among dozens still missing, said of the state’s governor. “That’s why we are very angry.”

Militants from Boko Haram attacked the Government Girls Science and Technical School in Dapchi on Monday evening, guns blazing, in an episode that evoked painful memories of the group’s 2014 attack on a school in Chibok that included the mass abduction of schoolgirls.

An official count of the missing in Dapchi hasn’t been released, although the governor’s office said it was working to compile one. Initial accounts from the police and state officials put the number somewhere between 50 and 100; Mr. Goniri said that 94 girls were still missing.