5th Man Held In Terror Probe

An ice cream truck that Umer Hayat drove for work is parked at his home in Lodi, Calif., Wednesday, June 8, 2005. Federal authorities arrested Hayat and his son, Hamid Hayat, after the younger man allegedly acknowledged that he attended an al-Qaida camp in Pakistan to learn "how to kill Americans," according to published reports. (AP Photo/Paul Sakuma)
Authorities have detained a fifth person in connection with a terrorism investigation in California's wine country.

Two American citizens of Pakistani descent are under arrested on terrorism charges. Three others were detained for immigration violations, reports CBS News Correspondent John Blackstone.

The latest detention, on immigration issues, appears to be Hassan Khan, 19, the son of Mohammed Khan, one of the imams who was initially taken into custody after meeting with the two suspected terrorists, reports Eric Alvarez of CBS affiliate KROV.

In a criminal complaint, the FBI says the father, Umer Hayat, paid for his son, 22-year-old Hamid, to attend a terrorist training camp in Pakistan. Hamid confessed the lessons included shooting at targets with "photos of various high-ranking U.S. political figures, including President Bush."

"He also confirmed that the camp was run by al Qaeda operatives and that they were being trained in how to kill Americans," said U.S. Attorney Scott McGregor.

Why Hamid Khan is now in detention is unclear, says Alvarez, unless he was present during the conversation between his father and the Hayats.

For nearly a century, Pakistanis have been a part of this farming town.

Today, they account for about 2,500 of Lodi's more than 62,000 residents. Pakistan's Independence Day — Aug. 14 — is celebrated just like the Fourth of July.

And when the nation came together to heal after Sept. 11, Islamic leaders in Lodi joined rabbis and priests and pastors in signing a "declaration of peace."

So it's no wonder that a terrorism investigation leading to the arrests of a father and son has shaken Lodi to its core.

Several Hayat family members live in Lodi. Cousin Usama Ismail tells Blackstone that Hamid Hayat was in Pakistan not to attend an al Qaeda training camp, but to get married.

Then why would he tell the FBI he was in a terrorist camp?

"Because they intimidate him," replied Ismail, 19, Umer's nephew and Hamid's cousin. "It wasn't a couple of hours of interrogation. We're talking about two days straight."

The arrests are the latest in a domestic crackdown on terrorism, reports CBS News Correspondent Bob Orr. "There is no way to know how many terrorist sympathizers or sleeper cells might be in the U.S., but the latest arrests suggest there are American citizens among them."

Keith Slotter, head of the FBI's central California office, alleges several people committed to al Qaeda have been operating in and around the tranquil wine-growing region just south of Sacramento.

"The concern right now in the intelligence community is that there may be a lot of these" around the country, said CBS News Homeland Security Consultant Randy Larsen.