Mouayed Bashir death: Answers sought from Gwent Police
More than 100 protesters gathered in Newport following the death of a man shortly after police were at his house.
Mouayed Bashir died on Wednesday after officers were called to his home in Newport at about 09:00 GMT.
The force has referred itself to the Independent Office for Police Conduct following the death, as is standard procedure.
It said the 29-year-old's condition worsened after they arrived.
He was pronounced dead at Cwmbran's Grange Hospital.