Armed men from Mozambique's former rebel group Renamo attacked a truck and a bus carrying civilians in the central Sofala province, killing two, authorities said.
"They (Renamo) attacked two vehicles - a bus and a truck ... there were two deaths in the truck and two civilian women injured in the bus," Arnaldo Machohe, administrator of the town of the Chibabava district, told AFP.
The Saturday incidents came two days after Renamo attacked a police squadron in the town of Muxungwe, 30 kilometres (20 miles) away; killing four police officers.
The group, armed with AK47 assault rifles, stopped the truck transporting petrol on the road leading to the capital Maputo, Machohe said. They killed its two occupants.
They also attacked an Intercape bus with around 60 passengers on board.
"Two women were injured on the bus. They are in hospital in Muxungwe," said Machohe.
"We don't know why they are stopping civilian vehicles. The population are fleeing their homes and fields. The whole district is living in fear," Machohe said.