Attorney General Eric Holder will announce Friday that five Guantanamo Bay detainees with alleged ties to the 9/11 conspiracy, including mastermind Khalid Sheikh Mohammed, will be transferred to New York to go on trial in civilian court, according to an Obama administration official.

Holder will also announce that five other detainees will be sent to military commissions for trial, said the official, who did not want to be named.

Holder has set a news conference for 11 a.m. to announce the decisions.

Mohammed “will be subject to the most exacting demands of justice,” President Obama said Friday in Japan.

“The American people insist on it, and my administration will insist on it,” Obama told reporters at a joint news conference with Japanese Prime Minister Yukio Hatoyama.

Mohammed is the confessed organizer of the September 11, 2001, attacks on New York and the Pentagon. But his confession could be called into question during trial. A 2005 Justice Department memo — released by the Obama administration — revealed he had been waterboarded 183 times in March 2003.

Obama has called the technique, which simulates drowning, torture.

Mohammed is one of five defendants in the 9/11 attacks being held at the U.S. military detention center in Guantanamo Bay, Cuba. The other four are Ramsi Binalshibh, Walid Muhammed bin Attash, Ali Aziz Abdul Ali and Mustafa Ahmed al-Hawsawi.

National Public Radio, citing “officials familiar with the situation,” said all five defendants will be tried in the U.S. District Court for the Southern District of New York, a short distance from where the twin World Trade Center towers once stood.