Iran announced on Monday it had captured 17 spies working for the U.S. Central Intelligence Agency (CIA) and sentenced some of them to death, deepening a crisis between the Islamic Republic and the West.

Iranian state television published images that it said showed the CIA officers who had been in touch with the suspected spies.

In a statement read on state television, the Ministry of Intelligence said 17 spies had been arrested in the 12 months to March 2019. Some have been sentenced to death, according to another report.

Such announcements are not unusual in Iran, and are often made for domestic consumption. But the timing suggests Tehran could harden its position in a standoff with Western powers which has raised fears of a direct military confrontation.

In recent weeks the United States has blamed Iran for attacks on shipping near the Strait of Hormuz, the global oil trade’s most important waterway, accusations Iran has denied.

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