By Cyrus OmbatiTanzanian police confiscated two cameras from relatives of one of the 14 Kenyans shot dead in Moshi.
They also rejected an independent post-mortem on the bodies by Kenyan doctors.
And in Nairobi, police on Tuesday sided with the Tanzanian authorities, saying six of the suspects had criminal records.
Police spokesman, Mr Eric Kiraithe, said they had not established the circumstances under which the other eight people died, but they believed they were accomplices
In Moshi, relatives of Anne Kang’ara and officials of Oscar Foundation had taken pictures of a Suzuki Vitara alleged to have been carrying the victims when they were shot dead, when police confiscated two cameras.
The officers also arrested a guide hired by the family to take them to the scene of the shooting.
Oscar official, Mr King’ara Kamau, said Kilimanjaro police had denied them permission to hire a private pathologist to carry out a post-mortem.
The officers insisted that only their government’s pathologist and two people would be allowed into the operation room.
“There is a standoff here because the post-mortem has not even started and they took away our cameras. We have not even viewed the bodies,” Kamau told The Standard by telephone.
Anne’s family was on Monday detained for hours as they sought permission to probe the incident.
In Nairobi, Kenyan police said they had established that Moses Kuria Kamau had been convicted of robbery with violence in 1997 and sentenced to death, but could not tell how he was released.
Another victim, David Njuguna Mbugua, was jailed for stealing by a Nakuru court in 1981, while Zachary Mwangi Kimathiro was charged with robbery in 2004.
Kiraithe said John Gikonyo Buku was in 1996 accused of preparing to commit an offence, and Philip Irungu Wanjiru was also charged with robbery in Nairobi.
Peter Maina Waweru was charged with robbery in a Thika court in 2004.
“We believe most of them had appealed their cases before they were released from jail,” said Kiraithe.
Others killed are Jeremiah Wachira Macharia, Wilson Irungu Kiige, David Njuguna Mbugua, Rudovic Gicheru Kariuki, Ephrahim Maina Mwangi and Genson Karuhi.