On Monday, Twitter said it would begin enforcing new rules that were announced a month ago as a way to "reduce hateful and abusive content."

In particular, the new rules ban violent threats or even "wishing for serious physical harm." For now, the most prominent accounts that have been removed for running afoul of these rules were three affiliated with a far-right United Kingdom group known as "Britain First." (For an example of the group's content: last month, President Donald Trump retweeted violent videos from the group that claimed to show violence perpetrated by Muslim immigrants to Europe, when in fact it did not.)

Twitter did not provide a list of other accounts that have been immediately affected, and the company did not respond to Ars’ request for comment pre-publication.

"Our hateful conduct policy and rules against abusive behavior prohibit promoting violence against or directly attacking or threatening other people on the basis of their group characteristics, as well as engaging in abusive behavior that harasses, intimidates, or uses fear to silence another person’s voice," the company wrote in a Monday blog post. The company went on to explain that its new policy includes any abusive language in the profile information of an account (in addition to applying to language used in tweets).

UPDATE 2:07pm ET: Liz Kelley, a Twitter spokeswoman, e-mailed Ars: "We do not have additional details to share regarding specific accounts."