24 killed since DRCongo election

"Human Rights Watch also documented an incident in which local youth in Kinshasa threw rocks at a priest who later died from his injuries," it added.

Since the election commission issued results on 9 December  showing Kabila had won the 28 November presidential vote, "security forces have been firing on small crowds, apparently trying to prevent protests against the result," said Anneke Van Woudenberg, senior Africa researcher at Human Rights Watch.

"These bloody tactics further undermine the electoral process and leave the impression that the government will do whatever it takes to stay in power," he said.

The human rights watchdog said after interviewing 86 victims and witnesses it had received dozens of reports of other killings and attacks by security forces which it is seeking to confirm and is "continuing its investigations."

Kabila's victory was upheld even after international observers criticised electoral conditions, citing problems in the vote count and the loss of huge numbers of ballots.

Opposition leader Etienne Tshisekedi contends that he won the poll but was denied victory by massive fraud.

He issued thousands of leaflets Wednesday calling on people to attend his own "swearing-in" ceremony taking place three days after re-elected head of state Kabila took office.

HRW said in its statement that "police and other security forces appear to be covering up the scale of the killings by quickly removing the bodies." It singled out the police and the republic guard - the presidential bodyguard - for blame.