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In page Mass grave:

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Approximately 100,000–200,000 civilians were killed at the start of the Korean War. These people were flagged by the government of South Korea for potentially collaborating with or sympathizing with North Korea. They were arrested and subsequently executed without trial.[1] The sites where the massacres occurred were forbidden to the public. The bodies were considered to be traitors and the act of associating with them was considered treasonous.[1] Despite this, families retrieved bodies from the shallow forbidden mass graves at the massacre sites.[citation needed]