Hundreds of thousands of Bangladeshi protesters demanding Prime Minister Sheikh Hasina resign clashed with government supporters Sunday, with dozens killed in one of the deadliest days since demonstrations began.

Rallies that began last month against civil service job quotas have escalated into some of the worst unrest of Hasina’s 15-year rule and shifted into wider calls for the 76-year-old to step down.

At least 77 people were killed on Sunday alone, including 14 police officers, with the rival sides battling with sticks and knives and security forces firing rifles, taking the total killed since protests began in July to at least 283.

Police said protesters attacked their officers, including storming a station in the northeastern town of Enayetpur.

“The terrorists attacked the police station and killed 11 policemen,” said Bijoy Basak, a deputy inspector general.

AFP journalists reported hearing sustained crackles of gunfire after dark on Sunday, with protesters defying a nationwide curfew.

Mobile internet was tightly restricted.