No militant group has immediately claimed responsibility for the attack.
Iran Foreign Minister Mohammad Javad Zarif condemned the attack and warned "terrorists" that they will be punished. The perpetrators behind this dastardly attack should be brought to justice expeditiously.
Chabahar is a free trade zone and the site of an Indian-backed port complex being developed as part of a new transportation corridor for landlocked Afghanistan. The suicide attacker, driving a vehicle loaded with explosives, drove up to the police headquarters, according to General Mohammad Pakpour of the Islamic Revolutionary Guard Corps.
India is developing the Chabahar port along with Iran and Afghanistan.
Sistan-and-Baluchestan - which borders Pakistan - has suffered several terror attacks targeting both civilians and security forces over the past years.
Bameri added that such attacks are meant to "destabilize Chabahar, Iran's largest oceanic port, and disrupt the peaceful and friendly climate in there".
The site of a terror attack in Chabahar a port city in Iran's southeastern Sistan-and Baluchestan Province
"Given its exemption from U.S. sanctions as well as its strategic location, Chabahar plays a significant part in the development of Sistan-and-Baluchestan Province and the eastern [transportation] corridor", Bameri said, adding, "Enemies have put destabilizing measures on their agenda to cause insecurity in this important region".
The attack comes as Iran's economy is reeling in the wake of the U.S.re-imposing sanctions lifted under Tehran's nuclear deal with world powers.
Iranian authorities said Rigi who headed the militant group Jundollah was captured on a flight from Dubai to Kyrgyzstan.
That attack was claimed by a Sunni Muslim group called, Jundallah, also known as Soldiers of God.
An official said that "the terrorist who carried out the attack was killed". A year ago the group claimed responsibilty for a blast at an oil pipeline in Iran's southern Khuzestan province.
A coordinated June 2017 Islamic State group assault on parliament and the shrine of Ayatollah Ruhollah Khomeini, the leader of Iran's 1979 Islamic Revolution, killed at least 18 people and wounded more than 50. "There can be no justification for any act of terror", an MEA statement said.
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In this 2017 photo, State Department spokeswoman Heather Nauert speaks during a briefing at the State Department in Washington . Trump told reporters last month the former Fox News anchor was "under very serious consideration ".