A protester has died in Belarus in police custody, the second death since clashes with police erupted on Sunday over a disputed presidential election.
Officials say the cause of death of the 25-year-old man in Gomel is unclear.
His mother says he had heart problems and was kept for hours in a police van.
In Brest, police said they used live bullets when they came under attack.
Meanwhile, the UN has condemned the use of violence by authorities, as protests continued for a fourth night.
The UN High Commissioner for Human Rights, Michelle Bachelet, said police officers were reported to have used excessive force, firing rubber bullets and water cannons, and also throwing stun grenades.
At least two hundred protesters have been wounded so far.