KINSHASA: Riot police opened fire on protesters in the Democratic Republic of Congo Thursday in a new bout of violence as the Senate was set to vote on a controversial bill that would extend President Joseph Kabila’s rule.

An international rights group said 42 people had been killed in three days of anti-Kabila demonstrations in Kinshasa, but the government angrily challenged the figures and said 12 people had died.

Thursday’s violence erupted in the eastern city of Goma — about 1,500 kilometers (900 miles) from the capital — when riot police fired on groups of several hundred demonstrators, an AFP correspondent said.

Protesters are rising up against legislation that would enable Kabila, who has been in power in the troubled country for 14 years, to extend his term beyond 2016 when his second mandate ends.

The International Federation of Human Rights (FIDH) said 42 people had been killed and dozens wounded in the protests in Kinshasa, a teeming tropical city of nine million people.

“As has unfortunately become a frequent occurrence in the DRC, the security forces have again demonstrated a totally excessive and disproportionate reaction by firing live ammunition on protesters,” it said in a statement.

“The authorities must put an immediate end to the repression, identify the perpetrators of the crimes and bring them to justice.”

But government spokesman Lambert Mende said 12 people including a police officer had been killed, and accused FIDH of being “manipulated” by an exiled Congolese group.

He described most of the dead as “looters” who had been killed by private security guards. Mende had said on Wednesday that about 340 “looters” had been arrested.

On Wednesday, the popular leader of the Catholic Church weighed into the turmoil, giving his backing to protesters.

“We denounce these actions which have caused death and we are launching this plea: stop killing your people,” Archbishop Laurent Monswengo said.

He called on the people of the giant central African country to use “all legal and peaceful” means to oppose the law change.

On Wednesday, dozens of students at Kinshasa university shouted “Kabila get out!” as police tried to block the demonstration

The United States joined the European Union in voicing concern over the rising violence, calling for restraint and backing elections in line “with the constitution.”