By DEVLIN BARRETT

Associated Press

WASHINGTON — In the biggest trial for the age of terrorism, the professed 9/11 mastermind and four alleged henchmen will be hauled before a civilian court on American soil, barely a thousand yards from the site of the World Trade Center’s twin towers they are accused of destroying.

It’s a risky move. Trying the men in civilian court will bar evidence obtained under duress and complicate a case where anything short of slam-dunk convictions will empower President Barack Obama’s critics.

The case is likely to force the federal court to confront a host of difficult issues, including rough treatment of detainees, sensitive intelligence-gathering and the potential spectacle of defiant terrorists disrupting proceedings. U.S. civilian courts prohibit evidence obtained through coercion, and a number of detainees were questioned using harsh methods some call torture.

Holder insisted both the court system and the untainted evidence against the five men are strong enough to deliver a guilty verdict and the penalty he expects to seek: a death sentence for the deaths of nearly 3,000 people who were killed when four hijacked jetliners slammed into the towers, the Pentagon and a field in western Pennsylvania.

“After eight years of delay, those allegedly responsible for the attacks of September the 11th will finally face justice. They will be brought to New York — to New York,” Holder repeated for emphasis — “to answer for their alleged crimes in a courthouse just blocks away from where the twin towers once stood.”

Holder said he decided to bring Khalid Sheikh Mohammed and the other four before a civilian court rather than a military commission because of the nature of the undisclosed evidence against them, because the 9/11 victims were mostly civilians and because the attacks took place on U.S. soil. Institutionally, the Justice Department, where Holder has spent most of his career, has long wanted to reassert the ability of federal courts to handle terrorism cases.

Lawyers for the accused will almost certainly try to have charges thrown out based on the rough treatment of the detainees at the hands of U.S. interrogators, including the repeated waterboarding, or simulated drowning, of Mohammed.

The question has been raised as to whether the government can make its case without using coerced confessions.

That may not matter, said Pat Rowan, a former Justice Department official.

“When you consider everything that’s come out in the proceedings at Gitmo, either from the mouth of Khalid Sheikh Mohammed and others or from their written statements submitted to the court, it seems clear that they won’t need to use any coerced confessions in order to demonstrate their guilt,” said Rowan.

Holder insisted the case is on firm legal footing, but he acknowledged the political ground may be more shaky when it comes to bringing feared al-Qaida terrorists to U.S. soil.

“To the extent that there are political consequences, I’ll just have to take my lumps,” he said. But any political consequences will reach beyond Holder to his boss, Obama.

Bringing such notorious suspects to U.S. soil to face trial is a key step in Obama’s plan to close the military-run detention center in Cuba. Obama initially planned to close the prison by next Jan. 22, but the administration is no longer expected to meet that deadline.

Obama said he is “absolutely convinced that Khalid Sheikh Mohammed will be subject to the most exacting demands of justice. The American people will insist on it and my administration will insist on it.”