A suicide bomber exploded Thursday in the middle of a crowd awaiting a visit by the Algerian president, killing 11 and wounding at least 37 people, security officials said.
The attack hit the town of Batna, located about 450 kilometers (279 miles) east of the capital, Algiers, the officials said. Batna was the last stop on President Abdelaziz Bouteflika's trip through the east of Algeria.
The Algerian leader is expected to comment on the attack in a speech later Thursday, local television reported.
There was no immediate claim of responsibility for the attack.