BAGHDAD, Iraq, Sept. 12 - In a series of tightly sequenced attacks, at least 25 Iraqis were killed by suicide car bombings and a barrage of missile and mortar fire in several neighborhoods across Baghdad on Sunday.

The attacks were the most widespread in months, seeming to demonstrate the growing power of the insurgency and heightening the sense of uncertainty and chaos in the capital at a time when American forces have already ceded control to insurgents in a number of cities outside of Baghdad.

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American forces appear to be facing a guerrilla insurgency that is more sophisticated and more widespread than ever before. Last month, attacks on American forces reached their highest level since the war began, an average of 87 per day.

In a Sunday appearance on the NBC News program "Meet The Press," Secretary of State Colin L. Powell acknowledged that the United States faced a "difficult time" in Iraq but had a plan to "bring it under control" before nationwide elections scheduled for January.

"It's not an impossible task," he said.

The violence, which began before dawn, all but paralyzed this country's capital city, where portions of several central highways were closed, and traffic slowed to a crawl.

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After the attack, fighters and gleeful onlookers scaled the burning armored vehicle, said Hassan Lazim, assistant security director at nearby Karkh Hospital who said he saw the scene. Reuters reported that several young men had hung a black banner of the Unity and Jihad militant group, believed to be linked to Al Qaeda, on the barrel of the Bradley's main gun.

Helicopters that flew in to protect the Bradley were then fired on from the ground and fired back, the military said in a statement, adding that the aircraft then destroyed the armored vehicle as well. The helicopters "fired upon the anti-Iraqi forces and the Bradley, preventing the loss of sensitive equipment and weapons." The military stressed that the helicopters had not fired indiscriminately into the crowd, but said, "An unknown number of insurgents and Iraq civilians were wounded or killed in the incident."

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In the fighting before and after the attack on the Bradley, 13 people were killed and 61 were wounded, the Iraqi Health Ministry said. A journalist for the Arabiya television network and a 12-year-old girl were among the dead, hospital officials said.

Al Arabiya showed dramatic footage that followed the journalist, Mazen al-Tumeizi, as he stumbled away from the scene of the airstrikes, yelling, "I'm dying, I'm dying!" More than 20 journalists have been killed here since the beginning of the American invasion.

"We can say there were innocent people who died," said Sabah Abud, head of emergency room statistics at Yarmouk Hospital, which received most of those wounded on Sunday.