A suicide bomber killed at least three people in Iran's southeastern port city of Chabahar on Thursday, state media reported.
Immediately after the bomber detonated the vehicle bomb, gunmen attempted to storm the police headquarters but were killed by security forces, Iranian media reported. "Three people were killed and some others were injured", Rahmdel Bameri, acting governor of Chabahar told state television, which reported the figure of 48 hurt.
Ground Force Brigadier General Mohammad Pakpour told semi-official Tasmin News Agency such a "blind terrorist attack" would achieve no results.
Iranian authorities have not identifed the perpetrator yet.
The so-called Ansar al-Furqan terrorist group later claimed responsibility for the assault.
Suicide bombings are rare in Iran, but Sunni militant groups have carried out several attacks on Iranian security forces in the Sistan-Baluchestan province in recent years.
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Videos posted on Twitter, purportedly from Chabahar, showed thick smoke rising from the area.
Another coordinated June 7, 2017 IS 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.
Chabahar, on Iran's south-eastern coast near the border with Pakistan, is home to a recently built port and is an "economic free zone".
Iran has stepped up security in border areas after gunmen in September opened fire on a military parade in Iran's southwestern city of Ahvaz, killing 25 people, nearly half of them members of Iran's elite Revolutionary Guards corps.
"Mark my words: Iran WILL bring terrorists & their masters to justice", the foreign minister emphasized.A year ago, the group claimed to have blown up an oil pipeline in Iran's southern Khuzestan province.
Chabahar Port, which is being developed with funding from India, has been described as India's "golden gateway" that will help boost trade links to land-locked Afghanistan and central Asia, while bypassing its regional rival, Pakistan. "There can be no justification for any act of terror", the ministry said.