What US embassy was abandoned on April 12th, 1975
Phnom Penh was abandoned after being besieged by the Khmer Rouge on April 12th 1975
### Instruction: What US embassy was abandoned on April 12th, 1975
### Context: 
### Answer: Phnom Penh was abandoned after being besieged by the Khmer Rouge on April 12th 1975</s>