Police in Bangladesh fired tear gas and stun grenades to disperse people who were demonstrating on Wednesday against the excessive use of force by authorities during protests earlier in July that left at least 150 dead.

The unrest is the biggest test facing Prime Minister Sheikh Hasina, 76, since she won a fourth term in January elections boycotted by the main opposition Bangladesh Nationalist Party, which were also marred by deadly protests.

Police said they used force when people in the northeastern district of Sylhet broke through barricades to march toward the courts.