Philippine National Police (PNP) Chief Director Ricardo Marquez asked the Nueva Ecija Province Police Office to explain the series of killings in the province.
The official wants to know whether the crimes are politically motivated.
Among the suspected political related motives is the killings of a barangay chairman in Cabanatuan and General Luna as well as the barangay captain in Cabiao.
Marquez said it is important to determine the motives of such crimes to assess the situation of politics in Nueva Ecija while the May 2016 elections is fast approaching.
It is known that Nueva Ecija is among the provinces under the election watch list.