The Incirlik Air Force Base in Turkey has some other American assets: several dozen B61 thermonuclear warheads. The base has been a linchpin in Nato’s southern flank for more than half a century, the staging ground for US anti-terrorism missions and the fight against Islamic State.

But the failed military coup against Turkish President Recep Tayyip Erdogan has increased long-standing concerns about the military usefulness and security of the Incirlik armoury, America’s largest foreign stockpile of nuclear weapons. Security remains at the highest level. Electrical power was restored Friday after a weeklong blackout that strained living conditions at the base. The 3,000 US service personnel stationed there have been ordered to remain inside the gates. Hundreds of dependents were sent home months ago because of fears of a terrorist attack.

The base was an operational centre of the attempted coup. Its commander and his subordinates were arrested on suspicion of trying to overthrow the Turkish government, leaving junior officers in control. The developments have shocked US military experts who say they demonstrate a worrying level of instability in Turkey’s military command close to the B61s.

Defence officials have never acknowledged the existence of these weapons on the base and refused at news briefings after the coup attempt to answer questions about them…….

The weapons are in underground vaults in a mile-long security zone at the base, protected by an Air Force guard unit with attack dogs. The nearly 12-foot-long weapons have devices that are supposed to prevent unauthorised detonation, but experts are divided on the effectiveness of those controls.

Unlike the strategic weapons that the US deploys in missile silos, submarines and intercontinental bombers, the B61s at Incirlik are tactical weapons that can be deployed at low altitude in the battlefield……..

“The weapons should be pulled back,” said Hans Kristensen, a nuclear weapons expert at the Federation of American Scientists. “They have been in excess of what is needed in Europe for the past two decades. And now we have this new situation. This is the US nuclear base closest to a war zone. The country has a deeply fractured political and military system.” http://www.scmp.com/news/world/europe/article/1994052/coup-attempt-turkey-raises-nuclear-concern-us-air-base