Amnesty International has called for a full inquiry into the deaths of at least six people in a 24-hour general strike in the Dominican Republic.
The strike followed months of protest
The human rights body said the country's authorities should bring those responsible to justice promptly.
Hundreds of activists were arrested in the run-up to the strike on Tuesday.
Labour unionists and students organised the demonstrations to protest against high prices and regular power cuts in the Caribbean nation.
The government accused activists of paying people to demonstrate, a charge the unions deny.
The strike paralysed the nation. Shops and schools were shut and buses remained parked.
Officials said six people had died, including one policeman, and dozens were injured in the accompanying violence.
Strike organisers gave higher casualty figures.
Amnesty said the strike was a culmination of months of protest.
"These most recent deaths come in the wake of months of civil disturbances ... in which scores of demonstrators and bystanders, as well as some police, have been killed or injured," the organisation's statement said.
"The authorities must demonstrate their commitment to international standards governing the use of force by law enforcement officials by promptly bringing those involved in the reported violations to justice before ordinary courts," it added.
The country's president, Hipolito Mejia, said on Sunday he would react "without leniency" to breaches of public order.
But he has since described the violence as "isolated" and indicated that he would hold discussions with "all the sectors of national life".