Twitter Inc  said on Tuesday it had suspended 636,000 accounts since the middle of 2015 as the company steps up efforts to tackle “violent extremism” on its micro-blogging platform. The new push is part of Twitter’s effort at helping the growing global concerns about people using social media to perpetrate violent extremism and tendencies that promote violence.

The company shut down a total of 376,890 accounts in the last six months of 2016, Twitter said in its latest transparency report.

Twitter also said it had started taking legal requests to remove content posted by verified journalists and media outlets.

Twitter said it had received 88 such requests, but had not taken any action on the majority of these requests.