What US embassy was abandoned on April 12th, 1975
Phnom Penh was abandoned after being besieged by the Khmer Rouge on April 12th 1975
<START_INST>What US embassy was abandoned on April 12th, 1975<END_INST><START_CTX><END_CTX><START_A>Phnom Penh was abandoned after being besieged by the Khmer Rouge on April 12th 1975<END_A>