The death toll from Kenya’s anti-government protests on Monday has surged to 31, marking the highest single-day toll since the demonstrations began earlier this year, the state-funded human rights commission said Tuesday.

At least 31 people died and more than 500 were arrested in anti-government protests across Kenya on Monday, the Kenya National Commission on Human Rights (KNCHR) said in a statement on Tuesday.

Simmering anger against President William Ruto’s government has boiled over into clashes between protesters and the police, who have deployed live rounds, tear gas and water cannons.