BAGHDAD, Iraq - The future of a U.S. military plan to erect concrete walls around Baghdad neighborhoods was in doubt Monday amid a growing outcry from Iraqis who said the barriers would fuel sectarian discord.

A day after Iraqi Prime Minister Nouri al-Maliki ordered a halt to the construction of a 12-foot wall that would separate Sunni Muslims from Shiite Muslims in the northern Adhemiya neighborhood, American officials said they'd reconsider plans for that barrier and several others in Baghdad. But they dodged questions over whether the construction would stop, and an Iraqi military official said it would continue.