Radical cleric Abu Hamza is reported to have arrived in the United States to face terror charges after he was extradited from Britain along with four other suspects.
Officials from the US Attorney's office in New York would not officially confirm the arrival of Hamza, but he is expected to face a judge in New York within 24 hours.
Hamza is wanted in the US on charges that include conspiring with Seattle men to set up a terrorist training camp in Oregon and helping abduct 16 hostages, two of them American tourists, in Yemen in 1998.
He has been in a British jail since 2004 on separate charges of inciting racial hatred and encouraging followers to kill non-Muslims.
Khaled al-Fawwaz and Adel Abdul Bary, who were reportedly on the same flight as Hamza to New York, were indicted with others, including Osama bin Laden, for their alleged roles in the bombings of two US embassies in east Africa in 1998.
Al-Fawwaz faces more than 269 counts of murder.
The US Attorney's office in Connecticut confirmed that Babar Ahmad and Syed Talha Ahsan are scheduled to be in US District Court in New Haven.
The pair face charges in Connecticut relating to websites that allegedly sought to raise money, recruit fighters and seek equipment for terrorists in Afghanistan and Chechnya.
"I am pleased the decision of the court meant that these men, who used every available opportunity to frustrate and delay the extradition process over many years, could finally be removed," Home Secretary Theresa May said.
"This government has co-operated fully with the courts and pressed at every stage to ensure this happened."