SEOUL—A top LG Electronics Inc. executive has been indicted by Seoul prosecutors for allegedly vandalizing several high-end washing machines manufactured by rival Samsung Electronics Co.

An LG Electronics spokeswoman said Sunday that Jo Seong-jin, head of the company’s home-appliance division, has been indicted on charges of deliberately damaging four Samsung “Crystal Blue” washing machines ahead of a trade show in Germany last September. Mr. Jo has also been charged with defamation and obstruction of business, she said.

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