Authorities said the fires had spread across 1,373 hectares (3,393 acres) by early Sunday, a 7% increase from the previous day, with dry weather and strong winds hampering containment efforts.The blazes are advancing toward neighborhoods in Otsuchi, a Pacific coastal town still marked by the devastation of the March 2011 earthquake and tsunami, which killed nearly a tenth of its population.

Evacuation orders remain in place for 1,541 households, affecting 3,233 residents roughly one-third of the town’s population.“Although the Self-Defense Forces are fighting the fires from the sky with helicopters, the dry weather and winds are helping the fires expand,” Otsuchi Mayor Kozo Hirano told a press conference.

Military helicopters continued aerial water drops over forested mountain areas on Sunday as emergency crews worked to prevent the flames from reaching homes and critical infrastructure.Residents watching the smoke spread expressed concern over the scale of possible destruction.

“A fire burns everything down. With a tsunami, you might have something left after the destruction,” said 74-year-old Yoshinori Komatsu as he watched helicopters dump water over the hills in the distance.

So far, only one minor injury has been reported a person who fell at an evacuation center, according to Japan’s Fire and Disaster Management Agency.The Japan Meteorological Agency said no rainfall is expected in the region on Sunday or Monday, though a brief shower is forecast for Tuesday, offering limited hope for natural relief.

Officials said the cause of the fires remains under investigation.Japan has faced increasing wildfire risks in recent years, particularly during dry seasonal periods, with mountainous terrain and strong coastal winds often complicating firefighting operations.

The current fires represent one of the most serious wildfire threats to northern Japan this year, placing renewed pressure on local emergency services and evacuation systems.