The Guinean Organisation for Defence of Human Rights put the toll at 157 people killed and more than 1,200 wounded.
Guinea's interior ministry told the BBC that a total of 57 people died during the violence.
Human rights groups say they have had reports of soldiers bayoneting people and women being stripped and raped in the streets during the protest.
The opposition has accused the army of taking away some bodies to hide the scale of the violence.
Capt Camara denied knowledge of sexual assaults, but admitted that some of his security forces had lost control.

He said he was waiting to hear exactly how many people had died.

"Frankly, it saddens me immensely. Frankly, it is very regrettable," he told French radio.

Capt Camara said he had not yet decided whether to run for the presidency and was unsure what the correct move would be.

There has been worldwide condemnation of the violence.

Video at source.

Horrific.