Al-Qaida's North African wing has claimed responsibility for two deadly car bomb blasts on Tuesday outside U.N. offices and another building in Algeria's capital.
The terrorist group says it carried out the bombings in a statement posted on its Web site.
Algeria's Interior Minister Noureddine Yazid Zerhouni says 22 people died in the blasts in Algiers. Hospital officials have put the death toll at more than 60.
Among the dead and wounded are students who were on a school bus near the constitutional court building when the attacks occurred.
The United Nations says at least four of its staff members are believed killed. The blast destroyed the offices of the U.N. Development Program and damaged the offices of the U.N. High Commissioner for Refugees.
A UNHCR official in Geneva says at least 12 U.N. staff members are missing.
U.N. Secretary-General Ban Ki-Moon condemned the attack in the "strongest possible terms."