The Counterterrorism Blog has all the details and links to the criminal complaint:

“An American citizen charged with receiving terrorist training at an Al Qaeda camp in Somalia — including classes in how to become a homicide bomber and ‘wage violent jihad’ — was taken into custody by FBI agents and returned to the U.S. Monday night night…” Daniel Joseph Maldanado, 28, a.k.a Daniel Aljughaifi, was charged with receiving training from a foreign terrorist organization and conspiring to use an explosive device outside the United States.

More from ABC News:

According to the criminal complaint, Maldonado, a Boston native, traveled from Houston to Africa in November 2005. By December 2006, the complaint says, he was in Somalia and had joined with the Islamic Courts Union and elements of al-Qaida to fight in a rebellion designed to overthrow the Somali government and install an Islamic state.

The complaint says Maldonado was issued an AK-47 rifle and attended two military training camps at which members of al-Qaida were present.

Maldonado was captured by the Kenyan military on Jan. 21 as he fled Ethiopian and Somali forces. He was expelled by Kenya and turned over to U.S. officials for his return to Houston.

It wasn’t clear Tuesday whether Maldonado had a lawyer.

Maldonado told FBI agents in Kenya that he went to Somalia to fight “jihad,” or holy war, for a true Islamic government, according to the complaint.

“I would be fighting the Somali militia, and that turned into fighting the Ethiopians, and if Americans came, I would fight them, too,” he is accused of telling the agents. He also told the agents he had “no problem” with killing Americans or with the Sept. 11, 2001, attacks, the complaint says.