Twitter on Thursday said it is worried about the safety of its staff in India and called for the government to respect freedom of expression, days after Indian police visited its office in New Delhi over its labelling of a tweet by a governing party spokesman as “manipulated media”.

Twitter has been involved in a tense battle with the Indian government, which has often asked it to restrict content alleging Prime Minister Narendra Modi’s administration is trying to silence criticism, including of its handling of the coronavirus pandemic.

Twitter said it has “concerns with regards to the use of intimidation tactics by the police” and “the potential threat to freedom of expression for the people we serve.”

Read: India asks Twitter to take down some tweets critical of its Covid-19 handling

On Monday, Indian police visited the Twitter office in New Delhi to serve a notice directing it to answer questions about its tagging of the tweet as manipulated.

“It appears that Twitter has some information which is not known to us on the basis of which they have classified it as such,” police said in a statement.

On Wednesday, the messaging app WhatsApp filed a lawsuit in Delhi High Court arguing that new government rules that require it to make messages “traceable” to external parties are unconstitutional and undermine the fundamental right to privacy.

WhatsApp currently uses end-to-end encryption for its messaging service, which encrypts messages in such a way that no one apart from the sender and receiver are able to read the messages sent between them.

Sweeping new regulations for technology companies were announced in February that hold them more accountable for content shared on their platforms. A 90-day grace period for complying with the rules ended on Wednesday.

Leaders from Modi’s party last week tweeted portions of a document they said was created by the main opposition Congress party to make the government look bad over its handling of the pandemic. Some Congress leaders complained to Twitter, saying the document was forged. In response, Twitter marked some posts as “manipulated media”.

Under Twitter rules, it applies “manipulated media” tags to posts that have been “deceptively altered or fabricated”.

Twitter said in its statement on Thursday that “to keep our service available, we will strive to comply with applicable law in India.”

“But, just as we do around the world, we will continue to be strictly guided by principles of transparency, a commitment to empowering every voice on the service, and protecting freedom of expression and privacy under the rule of law,” it said.

Critics accuse Modi’s government of silencing criticism on social media, particularly Twitter, a charge senior leaders of the governing party have denied.

The new social media regulations give the government more power to police online content. They require internet platforms such as Facebook and Twitter to erase content that authorities deem to be unlawful and to help with police investigations, including identifying the originators of “mischievous information.”

Social media sites, including Twitter, Facebook and WhatsApp, were given three months to comply.