Freelance journalists Oscar Nkala, Pamenous Tuso, Pindai Dube and Nqobani Ndlovu who works for the privately owned The Standard were arrested around midday at the camp about 40 km from Bulawayo.
The charges against the four journalists were not immediately clear.
Journalists in Bulawayo said the four got wind that the senior police officer whose name was not given was being evicted and they rushed to witness it.
But they were arrested immediately after arriving at the police camp along the Bulawayo-Harare road.
Efforts to speak to the journalists were fruitless as Nkala said they were not allowed to use their phones.
The Zimbabwe Union of Journalists has since issued an alert to all journalists about the arrests.
The latest arrests come hard on the heels of the detention of the editor of The Standard Nevanji Madanhire last month.
Madanhire had been arrested alongside journalist Patience Nyangove and Alpha Media Holdings human resources for a story on the detention of
Jameson Timba, the Minister of State in the Prime Minister’s Office that was published by the weekly paper.
Timba had been detained for allegedly saying President Robert Mugabe was a liar.
Zanu PF hardliners led by former Information and Publicity Minister Jonathan Moyo have been calling for tough action against journalists working for the private media accusing them of undermining Mugabe.