Warplanes have patrolled Turkey's skies following a failed coup, a sign that authorities fear the threat against the government is not yet over.

A senior official said Monday that F-16 jets guarded the Turkish airspace overnight, after a faction within the military launched an attempted coup late Friday against President Recep Tayyip Erdogan. The official spoke on condition of anonymity in line with government rules.

The coup plotters sent warplanes firing on key government installations and tanks rolling into major cities, but the rebellion was quashed by loyal government forces and masses of civilians who took to the streets. At least 294 people were killed and more than 1,400 wounded.

The state-run news agency, Anadolu, said Erdogan ordered the overnight patrol by F-16s.