The phrase "authorities alone" is correct and usable in written English.
It can be used to emphasize that only the authorities are involved or responsible for a particular action or decision, without the involvement of others.
Example: "The decision to implement the new policy was made by authorities alone, without any public consultation."
Alternatives: "only the authorities" or "the authorities exclusively".
You will know that in 2014 alone the Italian authorities alone suggested that up to 4,000 children had simply disappeared off their radar since arriving.
After Mr. Adnan was released in June after 55 days without eating, Mr. Allan, days into his own fast, decided to stare down the Israeli authorities alone.
A consultation paper is to be issued paving the way for politicians to remove themselves from deciding on mergers, which will normally be a matter for the competition authorities alone.
Somewhat akin to the argument which has been considered is the objection that the deputy marshals authorized by the act of Congress to be created and to attend the elections are authorized to keep the peace, and that this is a duty which belongs to the State authorities alone.
According to one account, he was left by church authorities alone and without food, in the middle of winter.
Transportation authorities alone are not responsible for fare hikes and bus cuts -- legislators in places like Albany and Boston also share part of the blame, she said.
That softens the blow, his authority alone enough to challenge the doomsayers, but still they prophesise doom.
WASHINGTON — Since 1978, a secret court in Washington has approved national security eavesdropping on American soil — operations that for decades had been conducted based on presidential authority alone.
But Israelis can no more trust the Palestinian Authority alone to restrict the inflow of weapons than Palestinians can trust Israelis to facilitate Gaza's commercial development.
Yet there are no proposals from within Cheshire to create an elected mayor and it has been argued that a combined authority alone would bring the county together.
Over the past four years, this local authority alone has granted planning applications for more than 800 basement extensions, refused 90, and has a further 20 outstanding.
