At least 19 people have been killed in the Indian capital during clashes between opposing protesters over a new citizenship law on Wednesday.

The move came as 19 people were killed and hundreds injured in a day of anti-Muslim violence by Hindu supremacist mobs in New Delhi over protests on a controversial citizenship law that has been deemed discriminatory toward Muslims.

The clashes, which coincided with a visit to India by U.S. President Donald Trump, erupted early this week between thousands demonstrating for and against the new citizenship law introduced by Prime Minister Narendra Modi’s Hindu nationalist led government. Critics say the law is biased against Muslims and undermines India’s secular constitution.