Several people were wounded Sunday in an explosion in Bandar Imam Khomeini, a port city in Iran, but few details have been released.

The city is located some 1,000 kilometers (620 miles) southwest of Tehran, in the oil-rich Khuzestan province.

Members of Iran’s Arabic-speaking minority have occasionally held demonstrations in recent years in the area, demanding more rights.

The Arvand and Ghadir  Petrochemical Companies are both located at the port, which is northeast of Kuwait City, and on the banks of the northwestern end of the Persian Gulf. 

Several cars were damaged and windows in nearby buildings were shattered, including those at a hotel, according to the report late Saturday by the semi-official Iranian news agency ILNA.

There were no details offered about the cause of the blast.

In the past, Iran has blamed such explosions on intelligence agents from Israel or Western nations such as the United States or Britain.