Pattali Makkal Katchi (PMK) chief S Ramadoss claimed in a tweet that 740 tonnes of ammonium nitrate was lying at Chennai port and demanded that chemical be disposed of as early as possible to avoid an incident like the one in Lebanon.
Australia is a major manufacturer and importer of ammonium nitrate, largely due to its applications in the mining sector.
Commercial explosives company Orica consistently stores between 6,000 and 12,000 tonnes of ammonium nitrate, as well as manufacturing roughly 430,000 tonnes of the chemical each year at Kooragang Island in the Port of Newcastle - barely 3km from the city centre.
Officials said this large consignment, meant to be sent to a group in the fireworks capital of India - Sivakasi - was seized at the Chennai port in 2015 and has been lying there ever since.
The seized chemicals are valued at around Rs.1.80Crore and were seized by Chennai customs in 2015.
"The news that 740 tons of ammonium nitrate ammunition has been stored in a warehouse near the Chennai port for 5 years is very shocking. To prevent this, the ammonium nitrate explosive substance in the warehouse should be safely disposed of and used for other purposes such as composting", he said in a tweet. It is a salt made from ammonium and nitric acid, and is highly explosive.
However, the consignment, imported from South Korea, was safe and an e-auction process was on to clear it, he said.
The storage of the chemical here became a cause for serious concern in the backdrop of the explosion of the chemical in the Lebanese capital city of Beirut on Tuesday, which killed 135 people and injured around 4,000.
'The importer had misdeclared the goods as ammonium nitrate of fertiliser grade whereas on examination it was found to be of explosive grade and that (the importer) had not followed the Ammonium Nitrate Rules, 2012, ' he said.
In pure form, ammonium nitrate (NH4NO3) is a white, crystalline chemical which is soluble in water. "This chemical substance is the cause of the biggest explosion in Lebanon!" "It should be used to manufacture fertilizers", he added.