He was later prosecuted in a civilian court, pleaded guilty and was sentenced to life in prison several weeks ago.
If prosecuted in a New York State court, he would have faced a maximum prison sentence of four years.
People who fail to pay the fine within a week could be prosecuted in a magistrates' court, with their fine raising to up to £1,000.
But this has done little to impress MPs, who say the men may be terrorists, but they're our terrorists and should be prosecuted in a British court.
Spain's best-known investigative magistrate, Baltasar Garzón, is now being prosecuted in a politically driven case that should have been thrown out of court.
It cited court cases allowing American citizens who had joined an enemy's forces to be detained or prosecuted in a military court just like noncitizen enemies.
If Mr. Maliki has proof that any detainees committed real crimes, they should be prosecuted in a just and transparent process.
Still, he said, if Mr. Walker committed war crimes, like taking civilian lives, he should be prosecuted in a military tribunal.
The judge called her forward, and dismissed her old charges, noting that they had not been prosecuted in a timely fashion.
Community elders who encourage parents or connive in their arrangements could also be prosecuted in a wide-ranging crackdown to be unveiled tomorrow.
If he had not done so, he would have been fined more and could have been prosecuted in a criminal court, the FSA said.
