The government of Lebanon has called on the Interpol to issue arrest warrants for the Russian Captain and owner of the vessel that brought a shipment of ammonium nitrate that led to a massive explosion at Beirut port in August.

The state news agency, NNA, reports that public prosecutors have asked Interpol to issue warrants against the two Russians as part of a widening probe into what caused the explosion, which killed nearly 200 people, wounded thousands, and devastated downtown Beirut.

Authorities have blamed the August 4 explosion on nearly 3,000 tons of ammonium nitrate, a material used in fertilizer but also explosives, that was stored in poor conditions at Beirut’s port for years.

Many questions remain about why and how the cargo was abandoned in Beirut amid allegations of negligence against Lebanese authorities. Nearly 20 people have been detained in Lebanon after the blast, including port and customs officials.

The Rhosus, a Moldovan-flagged cargo ship sailing from Georgia to an explosives factory in Mozambique, is widely understood to have brought the fertilizer to Beirut in 2013 during an unscheduled detour.

NNA did not give the names of the two men sought by the Interpol warrant, but it is a well-known fact that the Russian Captain, who sailed the vessel to Beirut in 2013, was Boris Prokoshev who is believed to still be in Russia.

Igor Grechushkin, a Russian businessman residing in Cyprus, is believed to have been the owner of the vessel. Grechushkin was questioned by police at the request of Interpol’s Lebanon office in August.

The Rhosus never ended up leaving Beirut due to a legal dispute over port fees and ship defects.

EDITORS NOTE: Graphic content / This picture taken on August 4, 2020 shows a general view of destruction in the Gemmayzeh area in the centre of Lebanon’s capital Beirut, following a massive explosion at the nearby port of Beirut. – Two huge explosion rocked the Lebanese capital Beirut, wounding dozens of people, shaking buildings and sending huge plumes of smoke billowing into the sky. Lebanese media carried images of people trapped under rubble, some bloodied, after the massive explosions, the cause of which was not immediately known. (Photo by – / AFP) (Photo by -/AFP via Getty Images)

In October 2014, the ammonium nitrate was moved to a warehouse at Beirut’s port that holds impounded materials and remained there until the explosion while the ship sank near the port in February 2018.