Reports now suggest schools across 21 of Iran's 30 provinces have seen suspected cases, with girls' schools the site of nearly all the incidents.
Three members of the London-based Iranian separatist group were arrested on Monday in Ringsted, 60 kilometres southwest of Copenhagen, for allegedly spying on people and companies over a period of six years from 2012.
Both Iran and Saudi Arabia are advancing domestic arms programs in the region’s Cold War.
The move came after Danish intelligence agency said the Iranian intelligence service "was planning an attack in Denmark" against three Iranians suspected of belonging to the Arab Struggle Movement for the Liberation of Ahvaz.
Iran has arrested 22 people in connection with a deadly attack on a military parade in the southern city of Ahvaz last week the intelligence ministry was quoted as saying on Monday.
The Ahvaz National Resistance has been in the headlines following the attack in Iran last week. The little-known separatist militant group has no international recognition; Iran accuses the US and Gulf States of backing it.
US Defense Secretary Jim Mattis says it was “ludicrous” for Iran to suggest US has anything to do with Saturday’s parade attack in southwestern city of Ahvaz in which at least 25 people were killed.
The attack killed at least 25 people almost half of them members of the country’s elite Revolutionary Guards.
The assault in the city of Ahvaz, which killed at least 25 and wounded more than 60 people, targeted a stand where Iranian officials had gathered to watch an annual event marking the start of Iran’s 1980-88 war with Iraq.
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