Many would-be tipsters had previously looked the other way because of intimidation or because they sought protection from local militias.
"These are people who in the past weren't willing to come forth because of the threats from militias," said Maj. Gen. Jeff Hammond, the top commander of U.S. forces in Baghdad. "Now they're telling the Iraqi army they've had it with the militia. 'Don't leave. We want you to stay here.'"
The chief Iraqi military commander in Baghdad, Gen. Abboud Qanbar, said the quality of the tips also has improved.