(CNN) -- Multiple bodies -- possibly as many as 20 by one account -- were found early Monday in a shallow unmarked grave near the Syrian city of Daraa, a center of unrest amid a nationwide wave of anti-government rage.
A local farmer told CNN that another farmer was heading toward his grove of olive trees on the outskirts of Daraa when he smelled the stench of bodies. The farmer searched the field and found a human hand protruding from the earth.
The farmer sought help from local residents and, working with a backhoe, the group unearthed seven bodies, five recognized as being from one family. Among the bodies were those of a young child and woman, the farmer said.
Within an hour of the discovery, the farmer said, Syrian army and security forces took control of the site, confiscating cell phones of witnesses.
Using the backhoe, the security forces continued digging and removing corpses, witnesses said.
"One of the diggers later told the community that around 20 bodies had been found at the site," Abdullah Abazeed, a prominent leader of the uprising in Daraa, told CNN.
CNN has not been granted access into Syria and is unable to independently verify witness accounts or indepenently confirm the body count.
Two amateur videos have surfaced on social media sites showing masked workers digging up deteriorating corpses and placing them in black body bags. While the description of the site appears to match the images, CNN has been unable to confirm the authenticity of the video.
Abazeed said that five of the bodies -- all male members of his extended family -- were returned to relatives and given an Islamic burial Monday afternoon. Abazeed said he believed his family had been targeted because of his role in opposing the government.
"The security forces have been raiding the House of Abazeed searching for me," he said. "They may have killed them when they found out they were members of my family."
Not all the bodies were immediately identifiable, activists said.
"The authorities sent the remaining bodies to the morgue for identification. Some of the bodies were bloated and others had been partially eaten by animals, making it difficult to ascertain the identity of the victims," said Dr. Ammar Qurabi, chairman of the National Organization for Human Rights in Syria.
The Syrian government has been clamping down on street demonstrations over the past two months in Daraa and other cities, and deadly clashes have erupted during anti-government protests. Demonstrators are calling for the end of the Bashar al-Assad regime and seeking greater political freedom.
The regime has blamed armed groups for the violence and has reported the deaths of security personnel. But the demonstrators, emboldened by the tough crackdown and the mass anti-government rallies in other Arab nations this year, have blamed the killings on the government.
The number killed in clashes with government forces has been put by various human rights groups at between 700 and 850, according to Rupert Colville, a spokesman for the U.N. Office of the High Commissioner for Human Rights.