US President Joe Biden has ordered B-52 bombers and Spectre gunships to target Taliban terrorists in Afghanistan who are advancing towards three key cities, Daily Mail reported.

The Cold War-era strategic bomber first flew in the 1950s but is still used due to its 70,000lb payload and range of more than 8,000 miles.

They are being supported by the AC-130 Spectre gunships which are armed with a 25mm Gatling gun, a 40mm Bofors cannon and a 105mm M102 cannon -- which can provide pinpoint accurate fire from the air.

B-52 bomber
B-52 Stratofortress taking off from Tinker Air Force Base, US.Wiki Commons/Balon Greyjoy

Reports said the B-52s and AC-130s are targeting insurgents around Kandahar, Herat and Lashkar Gar in Helmand Province.

The B-52s are operating out of Qatar, while the aircraft carrier USS Ronald Reagan is on deployment in the Arabian Sea. The nuclear-powered warship has a fleet of F/A-18 Super Hornets.

The Afghan Air Force is equipped with some turbo-prop light attack aircraft such as the A-29 Super Tucano, though only 30 pilots have been qualified since 2015.

US sends aid to Afghanistan

The Taliban have been advancing across Afghanistan after the US-led coalition pulled out of the war-torn nation, leaving the country's struggling defence forces to deal with the terrorists.

Earlier on Saturday, the Taliban captured Sheberghan city in Jawzjan. It was the second provincial capital to fall to the insurgents over the past 24 hours after Zaranj fell on Friday.

A video has emerged on social media which appears to show prisoners fleeing Shiberghan after the Taliban managed to gain control of the prison.

US army and Afghan National Army
WAKIL KOHSAR/AFP/Getty Images

Similarly, another clip on Twitter appears to show something similar that had happened in Zaranj, more than 700 miles away.

In Helmand's provincial capital of Lashkar Gah, Afghanistan's elite commando forces aided by regular troops were trying to dislodge the Taliban but with little success, said Nafeeza Faiez, a provincial council member.

(With inputs from IANS)