The offices of Twitter will temporarily close with immediate effect, the firm has informed its staff.
Employees were informed that the offices would reopen on November 21.
It did not state why it was moving.
The statement comes as there are rumours that several employees were leaving after the new owner, Elon Musk, told them to commit to “long hours at high intensity” or quit.
The message went on to say: “Please continue to comply with company policy by refraining from discussing confidential company information on social media, with the press or elsewhere.”
The reports have been met with consternation from unions with Prospect, the union for tech workers, asking Twitter UK to meet regarding the treatment of its employees.
There are indications that several employees have quit in protest at Mr Musk’s new conditions.
There will probably be less than 2,000 individuals remaining after the dust settles today, a former Twitter employee who chose to remain anonymous told the BBC.
They asserted that all members of their team had been fired.
“His manager, the team’s manager, was fired. The manager of that manager was afterwards fired. One of the executives fired on the first day was the person up there. As a result, no one is still in that chain of command.”
Another person claimed that despite being ready to put in long hours, they had quit their job.
When I was already putting in 60 to 70 hours per week, they claimed, “I didn’t want to work for someone who threatened us via email on several occasions about only “special tweeps should work here.”
Former Twitter vice-president Bruce Daisley told the BBC that some former engineers were saying that the social media site might “collapse as soon as Monday” in response to worker departures.
There are many aspects that, in his words, “actually seem to be based on having engineers on site.”
“The sustainability of the product is threatened if those engineers left.
So many people are sharing other web locations where you can locate them, I guess.