A US official said this week that Obama could participate in an Asean summit to be hosted in Cambodia in November.
Witnesses said security guards for the TTY Company opened fire with AK-47s.
Escapees climbed over the walls or jumped the metal gates of the Prey Speu Social Affairs Center Wednesday in full view of observers.
In her letter to the court, shared with reporters, she said she had paid the fine in full, from reductions in her parliamentary salary.
Asean countries are facing a multitude of issues which includes a dispute over the South China Sea.
The Documentation Center has provided around 500,000 documents to the tribunal since its inception.
Meanwhile, the US is making diplomatic efforts to improve its relationship in Cambodia.
Thirty-eight people remain in unlawful detention after they were seized by authorities as they protested outside City Hall this week.
Hor Namhong told reporters Thursday that Asean leaders could help ministers of North and South Korea meet on the sidelines.
The demonstrators were seized Wednesday, where they had demanded the courts release eight representatives arrested earlier this month.
Around 300 families lost their homes in the Jan. 3 forced eviction of Borei Keila.
An estimated 20,000 Cambodians are trafficked throughout the region each year.