LONDON (Reuters) - A British man accused of raising money through Internet sites in the United States for Islamic militants in Chechnya and Afghanistan was remanded in custody by a British court Friday on a U.S. extradition warrant.

Babar Ahmad, 30, of south London, appeared at Bow Street magistrates court after being arrested Thursday.

The extradition warrant says he solicited money for "acts of terrorism in Chechnya and Afghanistan" via U.S.-based Web sites and through e-mails.

Police sources said Ahmad's arrest was not linked to the detention of 12 men in Britain earlier this week under anti-terror laws.

"I don't want to go," Ahmad told the court after district judge Christopher Pratt asked if he would agree to extradition.

No application for bail was made, and another hearing was set for a week's time.

The warrant and criminal complaint unsealed Friday in New Haven, Connecticut, said Ahmad and others operated Web sites through Internet providers in Las Vegas and Trumbull, Connecticut.

Ahmad was charged with material support for terrorism, conspiracy to launder money to support the Taliban and Chechen rebels and other charges. If convicted, he faces anything from 10 years to life in prison.

"We are going to start right away to start the (extradition) proceeding," U.S. Attorney Kevin O'Connor told reporters in New Haven. "We are patient and know this kind of thing takes time."

The U.S. says Ahmad was encouraging Muslims to fight in Afghanistan and had documents on U.S. naval forces in the Gulf in his possession when he was arrested briefly in December.

Then, he was held for six days under anti-terror laws and released without trial.

Ahmad's defense lawyer Carolina Guiloff said he was assaulted by police at that time. His complaint is still under investigation by the Independent Police Complaints Commission.

The lawyer representing the U.S. government said in London Thursday the Web sites also told Pakistani nationals in Canada, the United States and Britain how to travel to Afghanistan via Pakistan to fight for the Taliban.

"Muslims must use any means at their disposal to undertake military and physical training for Jihad," said one of the Web sites, the lawyer said.

Ahmad was also linked to an e-mail account associated with a senior Chechen Islamic militant involved in the 2002 Moscow theater siege, in which 129 hostages and 41 rebels died, she added.

When British police raided his house in December, they found official U.S. documents detailing the workings of a U.S. Navy battle group in the strategic Straits of Hormuz at the entrance to the Gulf in April 2001, she said.

The documents outlined how U.S. warships enforcing sanctions against Iraq and conducting operations against al Qaeda were vulnerable to attacks from small craft and rocket-propelled grenades, she said.