2,750 tons of ammonium nitrate was impounded in Beirut's port after it was seized from an abandoned ship in 2014, years before the explosion

• Lebanon's Supreme Defense Council said on Tuesday that 2,750 tons of ammonium nitrate from an abandoned ship had been left in storage at Beirut's port, state media reported.
• The explosive chemical had been impounded on its way to Mozambique, according to reports from the time.
• Lebanese officials believe it was behind the explosion at Beirut's port on Tuesday, according to state media.
• A Beirut law firm said in a legal summary in 2015 that the ship, the MV Rhosus, had technical difficulties while sailing in September 2013, was forced into Beirut's port, and was banned from continuing. The ship's owner abandoned it, and the cargo was kept in Beirut.

For six years, 2,750 tons of highly explosive ammonium nitrate that had been seized from an abandoned ship was held in Beirut's port, Lebanon's state media reported on Tuesday.

Officials at a meeting of Lebanon's Supreme Defense Council said that the stockpile of the chemical — often used in fertilizers — was behind the devastating explosion at the port on Tuesday, according to the national TV channel LBCI.

After a tour of the site, Maj. Gen. Abbas Ibrahim, the director-general of Lebanese intelligence, attributed the blast to stored explosive materials, Lebanon's state information service said.

Business Insider has independently verified that a ship carrying the same cargo was abandoned in Beirut's port in late 2013. Business Insider was unable to find records about what became of the cargo in the years that followed.

After the blast on Tuesday, Lebanese Prime Minister Hassan Diab said it came from a "dangerous warehouse that has been there since 2014."

At least 100 people were killed and another 4,000 people were injured in the blast at the port, the Red Cross reported.

The defense council identified the ship that brought the ammonium nitrate to Beirut as the MV Rhosus, LBCI reported.

A 2015 legal summary detailing a case handled by the Beirut law firm Baroudi & Associates described how the Rhosus' cargo came to be at the city's port.

The ship had been sailing from Georgia to Mozambique with ammonium nitrate in September 2013 when it had technical difficulties that forced it into the port at Beirut, the summary said.

After an inspection by Port State Control, an arm of the International Maritime Organization, the ship was forbidden from continuing its voyage.

"Shortly afterwards the vessel was abandoned by her owners after charterers and cargo concern lost interest in the cargo," the Baroudi & Associates summary said.

Various creditors came forward, but "efforts to get in touch with the owners, charterers and cargo owners to obtain payment failed," it said.

Baroudi & Associates said it took on a legal case to force authorities to let the ship's crew go home "given the 'dangerous' nature of the cargo."

"Owing to the risks associated with retaining the ammonium nitrate on board the vessel, the port authorities discharged the cargo onto the port's warehouses," the summary said.

The summary was published in 2015 by The Arrest News, a newsletter from a maritime-law network in Spain called Ship Arrested. Both the newsletter's editor and the law firm confirmed the account as being from Baroudi & Associates.

As of the summary's publication, the cargo and the ship remained in port.