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Police in arrested an suspected of stabbing 10 other farm laborers to death following a quarrel over land, Iranian state media reported Monday. The rampage in a remote village in southeastern Iran was a rare such incident in the Islamic Republic.

The official IRNA news agency said four Iranians and six Afghans were killed, and one farm worker was wounded in the rampage on Sunday and was in hospital. According to the report, the suspect was mentally unbalanced.

has caused increased disputes over water resources and land with better access to water. Hunting rifles are the only weapon that Iranians are allowed to possess legally.

Violent acts have escalated in recent years in Iran as the country’s economic conditions deteriorate amid crushing American sanctions that helped spark soaring inflation and increasing unemployment.

In May, an employee fired from one of Iran’s largest state-owned financial conglomerates went on a shooting rampage at his former workplace in western Iran, killing three people and wounding five before turning the gun on himself.

In 2016, a 26-year-old man gunned down 10 relatives and wounded four others.