TURKISH citizens and police have ‘surrounded’ the Incirlik air base it operates with the United States — and where a large stockpile of NATO nuclear weapons is held — ahead of a visit by a senior US official tomorrow.

Reports out of Turkey suggest all entrances to the air base have been blocked by heavy vehicles and police sent to secure its peremiter.

The unusual nigh-time move sparked rumours of a second coup attempt on Turkish social media, with concerned citizens rushing to the air base to join the blockade.

The move comes less than a week after a top US Army general was accused by Turkish media of ‘leading’ the uprising against President Recep Tayyip Erdogan earlier this month.

US İncirlik air base cordoned off by municipality trucks and bulldozers due to 2nd coup rumors. Turkey pic.twitter.com/EuykMQ0m5w — ilhan tanir (@WashingtonPoint) July 31, 2016

But Turkish Minister for European Affairs has since reportedly sought to reassure local media, stating the mission was just a “safety inspection”.

Regional Governor Ahmet Cina has told Turkish news services: “Everthing is normal and controlled. There is no movement of our troops.”

US Joint Chiefs of Staff Chairman General Joseph Dunford is due to fly in for an inspection of the air base later today. He is also expected to hold talks with the Turkish government in Ankara.

Last week, General Dunford labelled Turkish claims that a retired US general was behind the coup as “absurd”.

The Turkish Hurriyet news service reported Turkish authorities had responded to “intelligence reports” by ordering the move about 11pm Turkish time.

It states ‘riot police’ and armed vehicles have ‘taken precautions’ around the base.

The air base has been a central facility in US and NATO efforts against Islamic State. It also houses a stockpile of nuclear weapons as part of NATO’s deterrence force.

Several of the aircraft used by coup forces during the failed uprising flew out of the Incirlik air base, which then had its power supply cut off for several weeks.

ARMED FORCES ‘REINED-IN’

Turkey will shut down its military academies and put the armed forces under the command of the defence minister, President Tayyip Erdogan said in a move designed to bring the military under tighter government control after a failed coup.

The changes come after more than 1700 military personnel were dishonourably discharged for their role in the abortive July 15-16 putsch. Erdogan, who narrowly escaped capture and possible death on the night of the coup, told Reuters in an interview last week that the military, NATO’s second-biggest, needed “fresh blood”.

The dishonourable discharges included around 40 per cent of Turkey’s admirals and generals.

Turkey accuses US-based Islamic cleric Fethullah Gulen of orchestrating the putsch, in which a faction of the military commandeered tanks, helicopters and fighter jets and attempted to topple the government. Erdogan has said 237 people were killed and more than 2100 wounded.

Gulen, who has lived in self-imposed exile in the United States for years, denies the charge and has condemned the coup.

So far, more than 60,000 people in the military, judiciary, civil service and schools have been either detained, removed or suspended over suspected links with Gulen.

Turkey’s Western allies condemned the attempted putsch, but have been rattled by the scale of the resulting crackdown.

Both the general staff and the intelligence agency now report to the prime minister’s office. Putting them under the president’s overall direction would be in line with Erdogan’s push for a new constitution centred on a strong executive presidency.

Erdogan also said that a total of 10,137 people have been formally arrested following the coup.