KUTUPALONG, Bangladesh (AP) — Thousands of Rohingya Muslim refugees on Saturday marked the one-year anniversary of the attacks that sent them fleeing to safety in Bangladesh, praying they can return to their homes in Myanmar and demanding justice for their dead relatives and neighbors.

More than 15,000 gathered in the morning on a hilltop in the Kutupalong refugee camp, part of a sprawling web of settlements that are now home to nearly 900,000 Rohingya who have fled Myanmar to escape violence.

The camps exploded in size last year after Myanmar's army launched a wave of anti-Rohingya attacks on...