The phrase "at once announced" is correct and usable in written English.
It can be used to indicate that something was announced immediately or simultaneously.
Example: "The results of the election were at once announced to the public, leaving everyone in suspense."
Alternatives: "immediately declared" or "simultaneously revealed".
Dr. D. W. Bliss, who was hastily called, at once announced that he was dying, and Mrs. Garfield and the consulting surgeons were summoned.
An uncommon market in the Caucasus Coalition adrift ReprintsThe ministry now in charge at once announced that it would "simplify" the environmental rules governing industry, suggesting a further relaxation of controls that have already proved ineffective.
Those egalitarian Swedes ReprintsThe ministry now in charge at once announced that it would "simplify" the environmental rules governing industry, suggesting a further relaxation of controls that have already proved ineffective.
But it was her eyes, wide apart, darkly translucent, like ale held to the light, that made her immediately likable, that at once announced her lack of suspicion, her considered and yet so easily triggered kindliness.
Before the game, General Manager Omar Minaya stood in a hallway outside the Mets' clubhouse practically doing two things at once, announcing the latest injuries, then defending how they had been handled.
He makes his exit from the back of the theatre, the giant doors opening up on to the real countryside, at once announcing his rejection of city life and his embracing of his responsibility to agriculture and to his peasants on his estate.
Jia Yueting, a former high-flying Chinese Internet tycoon, once dreamed of challenging Netflix, Apple and Tesla all at once, announcing billions of dollars in deals in recent years to expand his company, LeEco, beyond video streaming and into smartphones, electric cars and sports media.
"I'm gonna eat lunch and talk at the same time," she once announced to a surprised interviewer in Dublin.
The world's largest radiotelescope, the Square Kilometre Array (SKA), will be built in two places at once, planners announced today.
The music sounded like being trapped in a factory that makes nails while all the world's slot machines went off at once, all announcing the fact that you'd lost all your money.
But the irrepressible Larson — who once reportedly announced at a company barbecue that he would "take down" British competitor Dr. Solomon's Group Plc. "and I don't care if I make a goddamn dime" — just bought the desktop utilities software maker CyberMedia for about $130 million.
