Washington, Nov 21 (IANS): The US has conducted a series of airstrikes targeting opium processing labs in Afghanistan as part of a campaign targeting the Talibans $200 million-a-year drug trade.

The airstrikes were part of a joint US-Afghan operation targeting drug facilities in Taliban-controlled areas in northern Helmand province. Three of the strikes occurred in Kajaki district, four in Musa Qala and one in Sangin on Sunday.

General John W. Nicholson Jr., the commander of the US operations in Afghanistan, said on Monday that B-52 bombers and F-22 warplanes took part in the strikes, the first such attacks under new authorisations granted by President Donald Trump to officials conducting the war in Afghanistan, the New York Times reported.

"Heroin's become a global issue," General Nicholson said during a teleconference news briefing from Afghanistan. "These criminals living in Afghanistan who are closely linked to the Taliban are responsible for 85 per cent of the world's opium."

He said that the campaign against the Taliban drug labs, which he said numbered about 400 to 500 across the country, would continue into the foreseeable future. The US spends more than $8 billion to fight the drug trade.

In one of the strikes a US B-52 used 2,000-pound bombs to destroy a facility and 50 barrels of opium, which General Nicholson said had a street value of millions of US dollars.

He said that US forces had conducted hundreds of hours of surveillance and hundreds of analysts worked to identify the targets and minimize collateral damage.

There are 13 major drug trafficking organisations in Afghanistan, General Nicholson said, seven of which are in Helmand province.

Afghanistan's President Ashraf Ghani announced the operation via Twitter saying Afghan forces supported by international troops "launched operations in Helmand to abolish opium processing labs" and that eight labs were destroyed.

The new push against Taliban opium facilities comes in the wake of a new report by the UN Office on Drugs which recently estimated that opium production in Afghanistan had increased by 87 per cent in 2017.