Iran has accused Bahrain of trying to "create a climate of tension" in the Persian Gulf by making unfounded allegations against Tehran.
Sunni-ruled Bahrain announced on July 25 it had detained two men accused of trying to smuggle weapons from Shi’ite Iran.
On July 26, Iran's Foreign Ministry spokeswoman, Marzieh Afkham, called the allegation "baseless."
"This approach is not constructive and it will not stop Iran's trust-building policy to cooperate with regional countries to fight against extremism and terrorism," the official IRNA news agency quoted Afkham as saying.
Bahrain, which has a Shi’ite majority, said on July 25 it was recalling its envoy from Tehran in protest against what it described as "hostile" comments by Iranian leaders.
Last week, Supreme Leader Ayatollah Ali Khamenei said a nuclear deal Tehran agreed with world powers would not alter its support for the governments of Syria and Iraq, nor its backing for "oppressed people" in Yemen and Bahrain, and the Palestinians.