Police in New Delhi said they have filed a complaint against Nupur Sharma and others over her remarks on the Prophet Mohammed and for "inciting people on divisive lines" on social media.
Harshit Srivastava, who was arrested in Uttar Pradesh state, is accused of making inflammatory remarks against Muslims, police say.
Tehreek-e-Labbaik Pakistan activists used assault rifles and pistols to target police officers, as a result at least 3 officials were killed, dozens others wounded.
Shireen Mazari's tweet that French President Macron was treating Muslims like Nazis had treated Jews in World War 2 angers Paris which is seeking withdrawal of comments.
The attacker fled the scene after the shooting outside the church in Lyon, seriously wounding a Greek Orthodox priest, police said earlier.
Another bloody weekend in Iraq as sectarian violence shows no signs of abating.
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