Irfan Khan, a 37-year-old limo driver from Miami, was arrested Saturday at an El Segundo hotel. He appeared before a U.S. magistrate judge and requested bond. A hearing on that matter will take place Thursday.
In Florida, his father and younger brother were also arrested Saturday and face charges of conspiracy and providing material support to terrorists.
His father, 76-year-old Hafiz Muhammed Khan, is an imam, a spiritual leader for a mosque in Miami. His brother Izhar Khan, 24, is also an imam.
An adult daughter of the elder Khan, a younger grandson and an unrelated man in Pakistan were also implicated.
The grand jury indictment alleges that the six suspects conspired to collect and deliver $50,000 to Islamic terrorists in Pakistan, where even a little money can buy a weapon.
"You can purchase weapons and guns for $10," said FBI agent John Gillies. "You can see that $50,000 can go a long way."
The money allegedly helped support a school near the town where Osama bin Laden's compound was located.
The Pakistan Taliban is aligned with groups that claimed responsibility for the attempted bombing in New York's Time Square last year and another attack on a U.S. military base in Afghanistan where seven Americans were killed.
The U.S. attorney would not say what Irfan Khan was doing in Los Angeles when he was arrested, only that it was some sort of business trip for the limousine driver.
The Associated Press contributed to this report.