Police officials have said they want to question Mam Sonando in relation to the alleged movement in Kratie province.
Fundraising officially began over the Cambodian New Year last month for Wat Khmer in Lowell, Massachusetts.
The city of Lowell, Mass., officially coronated Cambodia Town during the Cambodian New Year.
Thet Sambath and co-producer Rob Lemkin answered questions from nearly 50 people in the audience after the film.
The center began 15 years ago, as a way to help treat Cambodians who could not afford expensive care or medicine.
In the US, kickboxing is undertaken more for exercise than for sport, with enthusiasts taking on the martial art to keep in shape.
They were treated to a wide variety of music, from traditional and folk to rap and hip hop.
As it has in the past, the festival opened with blessings to chase away evil spirits, bad karma and ill luck.
Former refugees at the congress said they wanted to share in the freedoms they were given.
Thet Sambath spent more than a decade in extensive interviews with Nuon Chea before his arrest and detention at the UN-backed tribunal.
The profits will go toward helping Caring for Cambodia, an NGO that helps more than 6,000 students.
For Nou Leakhena, however, the court is just one way to heal what she says is widespread post-traumatic stress from the regime.
Lowell has the second-largest population of Cambodians in the US, and will spend up to $700,000 when the project kicks off this summer.
Cambodian-Americans in San Jose, Calif., met this past weekend to discuss possible reparations the tribunal court might undertake.
Authorities reported that 345 were killed and 410 others were wounded in stampede.
The 93-minute film has won 16 awards in the US and other foreign countries, including the Special Jury Prize at Sundance.
Sam Rainsy said the case involves both Cambodia and Vietnam, which makes it international in scope.
Nearly 40,000 Cambodians live Lowell, and many of them were also victims of the Khmer Rouge.
