California (Web Desk): Angelina Jolie unveiled her new film on the horrors of the Khmer Rouge era at the ancient Angkor Wat temple complex in Cambodia .

Cambodia 's king and survivors of the communist regime were among hundreds of people invited to the debut screening of "First They Killed My Father", directed by Jolie and based on the memoirs of Loung Ung.

Loung Ung was five years old when Khmer Rouge troops, led by Pol Pot, swept into Phnom Penh plunging her family into a harrowing ordeal that saw them sent to brutal labour camps before her eventual escape to the United States.

In its quest for an agrarian Marxist utopia, the regime killed up to two million Cambodians between 1975-79 through execution, starvation and overwork. It is the second movie by Jolie to tackle the subject of genocide -- in 2011 she made a film about the Bosnian conflict featuring mostly local actors. But her latest silver screen offering is more personal.

Jolie adopted her first child Maddox from an orphanage in Cambodia 's western Battambang province in 2002 and she has been given Cambodian citizenship. The Hollywood star previously said it was Maddox who pushed her to make the film .