Followers of rebel cleric Muqtada al Sadr agreed late Friday to allow Iraqi security forces to enter all of Baghdad's Sadr City and to arrest anyone found with heavy weapons in a surprising capitulation that seemed likely to be hailed as a major victory for Iraqi Prime Minister Nouri al Maliki.

In return, Sadr's Mahdi Army supporters won the Iraqi government's agreement not to arrest Mahdi Army members without warrants, unless they were in possession of "medium and heavy weaponry."

The agreement would end six weeks of fighting in the vast Shiite Muslim area that's home to more than 2 million residents and would mark the first time that the area would be under government control since Saddam Hussein was toppled in 2003. On Friday, 15 people were killed and 112 were injured in fighting, officials at the neighborhoods two major hospitals said.

It also would be a startling turnaround in fortunes for Maliki, who'd been widely criticized for picking a fight with Sadr's forces, first in the southern port city of Basra and then in Sadr City.