General Bekir Ercan Van, the commander of Turkey’s Incirlik airbase, which is used both by the Turkish Air Force and NATO forces, has been detained by Turkish authorities accused of complicity in the attempted coup.

The senior Turkish military commander was arrested along with over a dozen lower ranking officers at the base, AFP reported. A government official has confirmed with Reuters that the general has been detained.

According to an agreement between Ankara and Washington, Incirlik is used by NATO and stores US tactical nuclear weapons. The airbase is also being used by the US to launch airstrikes on Islamic State (IS, formerly ISIS/ISIL) in neighboring Syria, which reportedly ceased following Friday’s military coup attempt.

In the wake of the failed military uprising, the Turkish authorities have been conducting “anti-coup” operations at the base. Some members of the Turkish Air Force have been arrested on suspicion of having supported the coup. Authorities have also claimed that at least one of the planes “hijacked” by the coup plotters was refueled at Incirlik, according to AFP.

Ankara has arrested some 6,000 people believed to have been involved in the attempted coup and the number “could surpass 6,000,” as the “cleansing” operation is ongoing, Turkish Justice Minister Bekir Bozdag said in a television interview, as cited by AP.

Addressing his supporters after the first victims of the uprising had been laid to rest, President Erdogan said on Saturday that the parliament may discuss reintroducing the death penalty in Turkey, Reuters reported. The remark reportedly came in response to the crowd, which was chanting for the perpetrators to be executed.