There was no immediate claim of responsibility.
A suicide auto bombing followed by an armed assault killed at least two people and wounded many more outside police headquarters in the port city of Chabahar in restive southeastern Iran on Thursday. Reuters could not verify the authenticity of the videos.
A suicide auto bombing was followed by an armed assault in Chabahar, Iran.
Separately, Brigadier General Ramezan Sharif, the spokesman of Iran's Revolution Guards Corps (IRGC), vowed a "crushing response" not only to the terrorists who carried out the attack but also to the "groups backing them".
Rahmdel Bameri, a provincial official, told state TV that a suicide attacker driving a vehicle loaded with explosives drove up to the police headquarters.
That attack was claimed by the Sunni separatist group Jundullah (or Soldiers of God), which has claimed responsibility for bombings in the past.
While rare, Iran has been targeted in recent years by militant attacks. "We express our condolences to the government and the people of Iran and the families of the victims of this attack", the Ministry of External Affairs said.
Tehran accuses its key regional rival Saudi Arabia and the USA of funding most of these groups, a charge Riyadh and Washington deny.
Pakistan strongly condemns terrorist auto bomb attack in Chahbahar in brotherly neighbouring Iran that has taken lives of 3 innocent people while injuring others.
Chabahar is a key port city on the Gulf of Oman about 100 kilometers west of Iran's border with Pakistan.
"Mark my words: Iran WILL bring terrorists & their masters to justice", the foreign minister emphasized.
Washington has granted exceptions to some USA sanctions on Iran for the project.
India has said it is ready to invest up to $500m in the development of the port that is key to its ambitions to chart a route to landlocked Central Asian countries and Afghanistan, bypassing Pakistan.
Such acts of violence will also "boost the Islamic Republic of Iran's resolve to fight terrorism", said Jahangiri, calling for all-out efforts to identify the perpetrators and bring them to justice.