The New York Times reports: Activists and experts who monitor the Twitter traffic of the Islamic State and its supporters noticed something odd last week when many accounts suddenly disappeared.

The activists exchanged messages about the missing accounts, suspecting they had been suspended.

On Thursday, a Twitter representative confirmed what some were saying and put a number on it. The social media network’s violations department suspended approximately 10,000 accounts on April 2 “for tweeting violent threats,” the representative said.

It was impossible to independently verify the assertion because Twitter’s data is not public. But it would be the biggest single mass purge by Twitter of accounts linked to the Islamic State, also known as ISIS, ISIL and Daesh, which some experts believe has as many as 90,000 affiliated accounts.

The suspensions came against a backdrop of rising criticism that Twitter has allowed the Islamic State to exploit the social network to spread propaganda, glorify violence and seek recruits.

Twitter previously acknowledged suspending as many as 2,000 ISIS-linked accounts per week in recent months.

On March 31 the New York Times reported: A cybersecurity activist who recently helped publicize 9,200 Twitter accounts that were said to be linked to the Islamic State released a roster of 26,382 accounts on Tuesday, the biggest such list yet.

But the new list distributed by the activist, who goes by the Twitter name XRSone, appeared to be far from flawless.

It misidentified Al Jazeera’s popular Arabic-language Twitter account as suspect, for example. Also erroneously listed, among others, were Zaid Benjamin, a Washington-based journalist with 82,300 followers who works for Radio Sawa, an Arabic-language broadcaster partly funded by the United States, and Yousef Munayyer, a prominent Palestinian rights advocate based in Washington, with 23,400 followers.

Reached late Tuesday by email, XRsone said the erroneously included accounts had been removed. He also said he believed that the list still “has a high accuracy,” and that his intent was to show that more could be done to expunge Islamic State supporters from Twitter, where by some estimates they have registered as many as 90,000 accounts.