An Aurora man embroiled in a multistate terror investigation arrived for a third round of questioning with federal agents today, and his father also was interviewed.

Attorney Arthur Folsom said his client, Najibullah Zazi, 24, is exhausted.

"He'd rather we be done," Folsom said this morning. "He understands that we need to get this done."

Zazi's father, Mohammed, met with the FBI this afternoon. He left the Federal Bureau of Investigation offices shortly before 4 p.m. He said he had seen his son but provided little more information.

"I don't know what's going on," Mohammed Zazi said. "Really, I don't know, and I want to find out what's going on. Nobody tells me."

Multiple news agencies — citing anonymous sources — have reported that the investigation is focused on possible al-Qaeda-linked individuals and a potential plot involving peroxide-based bombs concealed in backpacks. The Associated Press quoted an unnamed official Thursday as saying that Zazi had contact with a known al-Qaeda associate and that agents had been monitoring five people in Colorado, including Zazi. The official did not provide more specific details.

Folsom said Zazi is not connected to al-Qaeda and isn't a terrorist.

He said Thursday that he was confident Zazi, who has proclaimed his innocence, would not be arrested.

Agents of the Joint Terrorism Task Force executed search warrants at Zazi's apartment near East Smoky Hill Road and E-470 and at the nearby home of Zazi's aunt and uncle on Wednesday.

There was no word Thursday regarding what, if anything, investigators recovered in those searches.

Today, the FBI declined to provide full details giving a legal basis for the searches. But they had a proper affidavit, said Kathleen Wright, a spokeswoman for the FBI in Denver.

"There has to be one, since we had a search warrant. But it is not publicly available," Wright said.

Folsom said he has not yet seen all of the legal paperwork from Wednesday's searches.

"I haven't been shown the supporting affidavit for the warrant. The warrant looks legitimate," he said.

Zazi was born in Afghanistan and moved to Pakistan when he was 7, Folsom said. As a teenager, he moved to New York City, where his family had settled. He operated a coffee cart in Manhattan before moving to Denver earlier this year. Zazi has a wife in Pakistan and said he visited her several months ago.

Federal officials stepped up their investigation after Zazi rented a car Sept. 9 in Colorado and drove to New York City. He said he was traveling there to deal with an issue related to the coffee cart, which his family still owns. While he was there, police stopped him on a bridge leading into the city and searched the rental car. They later towed the vehicle.

Zazi flew back to Colorado and learned from friends who called him that FBI agents had raided three locations in the New York City borough of Queens.