Police would not comment, but a local militärbefäl confirms the attack.
– We urge people to stay inside in the villages where they have the protection of the police and the military, " he says.
Since October of 2017 has close to 200 civilians, police and soldiers had been killed in the unrest in the gas - and oil-rich province. President Filipe Nyusi has strengthened the military in the area to meet the threat from the islamists.
Extremists are trying to use the province as basområde, which the governments of both Mozambique and Tanzania are trying to stop.