Twitter says it has shut down over 235,000 accounts with links to extremist organizations within the last six months alone, bringing the total number of suspended accounts up to 360,000 for the last year.

But the microblogging service says it still has its work cut out for it. A number of extremist organizations with links to terrorist activity use social media as a tool to communicate with one another, as well as to recruit new members. Social media companies such as Twitter and Facebook have been struggling to prevent their platforms from being misused. Twitter Chief Executive Jack Dorsey (pictured above) said in June that the company is “very aggressive” in shutting down these accounts, with help from governments around the world.

There have even been several instances of social media being used to coordinate attacks, such as the attack of a British soldier in London in 2013. A subsequent report by the U.K.’s Intelligence and Security Committee (ISC) of Parliament even suggested that Facebook might be at fault for failing to notify authorities of online conversations between the attackers that occurred before the attack.

While Twitter touts its success in suspended hundreds of thousands of extremist accounts, the company says there is no easy solution to the problem.

“As we mentioned in February, and other companies and experts have also noted, there is no one ‘magic algorithm’ for identifying terrorist content on the Internet,” Twitter said in a blog post. “But we continue to utilize other forms of technology, like proprietary spam-fighting tools, to supplement reports from our users and help identify repeat account abuse.”

According to Twitter, over one-third of the extremists accounts it has suspended were caught by automated systems, and the company said that it plans on continuing to invest in this technology to improve its detection rates.

Twitter said that it has also formed partnerships with a number of counter-extremist organizations from around the world, including  Parle-moi d’Islam, Imams Online, Wahid Foundation, The Sawab Center and True Islam. The company said that its goal in forming these partnerships is to “empower credible non-governmental voices against violent extremism.”

The company will provide more detailed information about its progress in fighting extremist accounts in its annual transparency report at the beginning of 2017.

Photo credit: Esten Hurtle (@esten) for Twitter, Inc.