All the three countries have been on this list of the US for the past several decades.
Iran was designated as State Sponsor of terrorism in 1984 and Sudan in 1993. Syria was designated as State Sponsor of terrorism way back in 1979.
In its annual report to the Congress, the State Department alleged that the Syrian regime of Bashar Assad continued its political and military support to a variety of terrorist groups affecting the stability of the region as the Syrian conflict entered its sixth year.
The Assad regime's relationship with Hizballah and Iran grew stronger in 2016 as the regime became more reliant on external actors to militarily fight the Syrian opposition, it said.
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Iran, the report alleged, continued its terrorist-related activity in 2016, including support for Hizballah, Palestinian terrorist groups in Gaza, and various groups in Syria, Iraq, and throughout the Middle East.
Iran used the Islamic Revolutionary Guard Corps-Qods Force (IRGC-QF) to implement foreign policy goals, provide cover for intelligence operations, and create instability in the Middle East, it alleged.
Iran has historically provided weapons, training, and funding to Hamas and other Palestinian terrorist groups, including Palestine Islamic Jihad and the Popular Front for the Liberation of Palestine-General Command, the report alleged.
The report indicated that Sudan, which was designated as a State Sponsor of Terrorism in 1993 due to concerns about support to international terrorist groups, including the Abu Nidal Organization, Palestine Islamic Jihad, Hamas, and Hizballah, could be taken off the lust.
"Sudan takes seriously the threat posed by ISIS, and in September 2016, the US government acknowledged the Government of Sudan's significant efforts to counter the ISIS and other terrorist groups and to prevent their movement into and through Sudan. Earlier, in June 2016, a senior US official praised Sudan for its counterterrorism efforts as well," the report said.
To designate a country as a State Sponsor of Terrorism, the Secretary of State must determine that the government of that country has repeatedly provided support for acts of international terrorism.
A wide range of sanctions are imposed as a result of a State Sponsor of Terrorism designation, including a ban on arms-related exports and sales; controls over exports of dual-use items, prohibitions on economic assistance; and imposition of miscellaneous financial and other restrictions.