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NAIROBI, Kenya (CNN) -- The FBI denied a report Thursday that it had made another arrest in connection with the bombings of two U.S. Embassies in Africa last August.

A source at the U.S. Embassy in Kenya's capital, Nairobi, had told CNN that a suspect was arrested in the Kenyan port of Mombasa "in expectation that he would be tried on charges in New York."

Late Thursday, the embassy source acknowledged no arrest had been made.

In New York, FBI spokesman Joe Valiquette denied a new suspect was in custody.

"There is no one new under arrest, and there is no one being flown back to the United States to face charges," he said.

The FBI office in New York did say that Kenyan authorities had recently detained two people for questioning -- but both were released.

On August 7, two car bombs exploded nearly simultaneously outside the U.S. Embassies in Nairobi and Dar es Salaam, Tanzania, killing 224 people, including 12 Americans.

Mahdouh Mahmud Salim is charged with one count of conspiracy to kill U.S. nationals in connection with both bombings. He was arrested in Germany last September and extradited to the United States in December. Salim pleaded not guilty in a New York courtroom January 14.

Three others charged in connection with the Nairobi bombing - - Wadih El Hage, Mohamed Sadeek Odeh and Mohamed Rashed Daoud Al-'Owhali -- appeared with Salim in a New York courtroom for a pretrial proceeding. They previously had pleaded not guilty to charges stemming from the bombing.

Still at large are several other people who have been indicted in connection with one or both of the embassy attacks but have not been captured -- including Osama bin Laden, whom U.S. officials have accused of masterminding and financing the bombings from a base in Afghanistan.

The U.S. State Department is distributing wanted posters of bin Laden worldwide and is offering a $5 million reward for information leading to his arrest.

Government sources have told CNN that Africa, several countries in Asia and Europe and a few in Latin America are considered high-risk areas for potential terrorist attacks on Americans.

Reports of terrorist threats increased sharply after the United States launched airstrikes on terrorist targets in Sudan and Afghanistan in retaliation for the embassy bombings.

In addition to U.S. government employees and facilities, U.S.-owned businesses are often targets of terrorist groups, one U.S. official told CNN.

"They're targeting places like Citibank, McDonald's and Kentucky Fried Chicken all the time," the official said.

Secretary of State Madeleine Albright, Attorney General Janet Reno and FBI Director Louis Freeh testified before a Senate panel Thursday about U.S. efforts to counter terrorism both at home and abroad.

Nairobi Bureau Chief Catherine Bond contributed to this report.

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