Njwayo said despite the arrest of the suspects, also state forces continue to hunt for other suspects involved in such acts.
"There are people who suspected that many have been arrested and are undergoing interrogation, there are others sought and found they were interrogated, but not arrested in the sense that it is proved they are criminals," he said.
In another development, he urged citizens of these areas continue to perform their activities, but with caution.
"People are digging, carrying out the activities of the government are doing, but this is done we find evidence for an example of these four people were killed while Rufiji, so the situation is not so. We are now to do their activities with caution, seeing a stranger give notice in containers.
"And if they have the information to tell us, we know these people are in the community, it is impossible to someone who does not know you to come and strike you to shoot evening, he must know and if he did not know then shares with the person know. So we encouraged them to these our citizens have a security precaution, "he said.
Asked what he found in those events more targeting government officials, said the issue is difficult and still uncertain because of the crime.
"We do not know what the reason is, but it's really the people who have the problem are soldiers, there are government officials or village or the ruling party," he said.
Initially, Njwayo clearly acknowledged that people in these areas live in fear because cases are not common.
"You should not fear, even in your home you're eating someone comes wants to shoot people and they heard a gunshot must they fear, it is a matter of each person in his right mind should ahofie.
"But we on our side of the litupendezi this district, we have many steps we took to cooperate with the central government to fight this," he said.
Statement Njwayo come a few days after the killing strangers retired Chairman of Chama Cha Mapinduzi (CCM) Village Muyui, Iddy qat, while his son, Nurdin qat, was shot in the stomach Kibiti district.
The killers after implementing such atrocities had vanished unknown, threatening state security of citizens and their property, while others were forced to flee their homes for fear of losing life.
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Police Coast confirmed the incident and said continues to hunt down criminals and strengthen protection