SAN DIEGO -- A San Diego man suspected of providing financial assistance to two terrorists involved in the deadly attacks last week was in custody Tuesday and federal agents sought other possible local suspects, 10News reported.

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Agents tracked the man through local bank records, The San Diego Union-Tribune reported. The man, whose name was withheld, was arrested on Sunday night, according to the newspaper.

"(He) was an associate, friend and facilitator for the two of them," a federal official told the newspaper, referring to Nawaf Alhamzi and Khalid Al- Midhar.

Alhamzi and Al-Midhar, along with a man named Hani Hanjoor, have been identified as hijackers.

Authorities say that Alhamzi, 25, Al-Midhar, 34, and Hanjoor, 29, lived for a time in Clairemont Mesa and Lemon Grove in the year leading up to the attacks in New York and at the Pentagon.

While in San Diego, the men apparently sought training as pilots and may have attended at least one community college, FBI Special Agent Erika Foxworth said.

Authorities told the newspaper that the man arrested on Sunday is believed to be a national of a Middle Eastern country. They traced him through bank accounts other financial records.

The man was arrested somewhere in San Diego County and was being held on immigration violations while prosecutors gather evidence against him, the newspaper reported.

So far, federal agents have arrested 49 people on immigration violations -- including the San Diego man -- who are believed to be implicated in the attacks.

Government officials have declined to identify any of the suspects.

Federal investigators in San Diego Tuesday continued questioning anyone else whose path may have crossed that of Alhamzi, Al-Midhar and Hanjoor during the trio's time in the city, Foxworth said.

At Montgomery Field airport in central San Diego, the pair had sought instruction on how to pilot passenger jets, the president of a flight school there said.

Fereidoun Sorbi (pictured, left), 52, president of Sorbi's Flying Club at Montgomery Field, said that he first met the two men in May of last year, 10News reported.

"The first day they came in here, they said they want to fly Boeings," Sorbi told The Los Angeles Times. "We said you have to start slower. You can't just jump right into Boeings."

Sorbi said that Al-Midhar and Alhamzi took introductory lessons in one of the school's small planes and he suggested that they learn how to speak English if they were serious about becoming pilots.

"We told them to go to college and learn to speak English," Sorbi told The Times. "They said they were."

The FBI was investigating whether the pair attended nearby Mesa College and other community colleges.

The chancellor of the San Diego Community College District, Augie Gallego, said that the FBI has asked to see records from the three colleges in the district.

Sorbi said that Al-Midhar and Alhamzi were accompanied by two other men, both of whom were called a name that sounded like "Hani."

On Friday, FBI and Bureau of Alcohol, Tobacco and Firearms agents searched a Lemon Grove home where Alhamzi and Al-Midhar once lived.

Agents spent seven hours sorting through the home of prominent Muslim leader Abdussattar Shaikh, who rented a room to Alhamzi and Al-Midhar from September through December last year.

Shaikh -- a retired San Diego State University professor who also serves on the city's police review board -- said that agents seized a computer, handwriting samples and textbooks and notebooks that once belonged to the men.

Shaikh is not a suspect, and he cooperated in the search of his home, Bill Gore, special agent in charge of the FBI's San Diego field office, said.

Al-Midhar and Alhamzi also lived at the Parkwood apartment complex in Clairemont with Hanjour.

The men lived in Apartment 127, and residents said they often stood on their first-floor patio and whispered into cell phones.

They said that the men could also be seen using flight-simulator-type software on their computer. Microsoft, which makes simulator software, has pulled the product from the shelves.

The FBI confirmed that Alhamzi rented the apartment in San Diego, which is not too far west of Montgomery Field.