Iranian President Ebrahim Raisi arrived in Sri Lanka on Wednesday to inaugurate a power and irrigation project, unaccompanied by his interior minister who is being sought for arrest over a deadly 1994 bombing.

Raisi travelled to the island nation after concluding a state visit to Pakistan alongside Ahmad Vahidi, accused by Argentina of orchestrating the 1994 attack on a Jewish community centre in Buenos Aires that killed 85 people.

Interpol issued a red notice requesting police agencies worldwide to take Vahidi into custody, and Argentina had asked both Pakistan and Sri Lanka to arrest him.

But the minister was not seen accompanying Raisi, who had arrived in Sri Lanka to inaugurate an Iran-backed power and irrigation project.

Iran's official news agency IRNA reported that Vahidi was back in Iran on Tuesday, where he attended a ceremony to induct a new provincial governor.

An official from Sri Lanka's foreign ministry told AFP that the interior minister was not listed as part of the Iranian delegation.

The 1994 assault has never been claimed or solved, but Argentina and Israel have long suspected the Iran-backed group Hezbollah carried it out at Iran's request.

Prosecutors have charged top Iranian officials with ordering the attack, though Tehran has denied any involvement.

The court also implicated Hezbollah and called the attack against the AMIA -- the deadliest in Argentina's history -- a "crime against humanity."

- Dam project -

Raisi arrived at an airport in southern Sri Lanka on Wednesday morning to inaugurate the Iran-backed $514 million Uma Oya irrigation and hydro-electricity project.

It was due to be commissioned in March 2014 but sanctions against the Islamic Republic saw the project mired in a decade of delays, Sri Lanka has said.

Sri Lanka funded most of the $514 million project after an initial investment of $50 million from the Export Development Bank of Iran in 2010, while construction was carried out by Iranian firm Farab.

Sri Lanka President Ranil Wickremesinghe's office said Raisi's visit symbolised "the cooperation between the two nations in this significant infrastructure endeavour".

The two reservoirs are slated to irrigate 4,500 hectares (11,100 acres) of new land, while the hydro dam generators have a capacity of 120 megawatts.

Iran is a key buyer of Sri Lanka's tea, the island's main export commodity.

Sri Lanka is currently repaying a legacy debt of $215 million for Iranian oil by exporting tea. The country's only oil refinery was built by Iran in 1969.

Raisi arrived in Sri Lanka after a three-day visit to Pakistan that followed tit-for-tat missile strikes in January in the region of Balochistan, which straddles the two nations' porous border.

Tehran carried out the first strikes against an anti-Iran group inside Pakistan, with Islamabad retaliating by hitting "militant targets" inside Iran.

Both nations have previously accused each other of harbouring militants on their respective sides of the border.