Azimio leader Raila Odinga has said investigations in Shakahola forest should only continue with the presence of the media.
On Friday at a rally in Kibera, Raila condemned the Kilifi cult incident, saying it is a massacre that has never been witnessed in the country.
"The investigations going on in Shakahola should not happen without the presence of the media, we don't want police to block journalists because more than 100 bodies have been exhumed," he said.
Following Interior CS Kithure Kindiki's declaration that the area was a crime scene on Wednesday, the police forbade the media from covering the exhumation of bodies inside Shakahola Forest.
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The CS declared the place unsettling and gave the go-ahead for a security operation to expel everyone still living there.
Pastor Paul Mackenzie of the Good News International Church owns the 800-acre property.
Mackenzie is suspected of indoctrinating churchgoers into dying of fasting under the pretence of going to heaven to meet Jesus.
From dozens of shallow masses in the forest, approximately 100 bodies have so yet been found.
Raila said journalists should be allowed to take pictures of the bodies being exhumed.
"People are being killed and buried as a family in one grave. It is a bad thing that we all condemn harshly," he said.
The Opposition chief said the government should hire experts from outside the country to investigate the deaths.
He called on President William Ruto to personally look into the Shakahola killings.
