This has grounded many operations in the expansive county for the last two weeks, which has left at least 15 people dead.
On Tuesday morning, at least three police were injured when Al-Shabaab gunmen attacked their vehicle in Bambahowla area, Mandera County.
This came a day after the gang killed three people and abducted three others in Falama and Jabibar areas of the upper Northeastern region along the common border with Somalia.
On Tuesday, the police vehicle from Wargadud police station was heading for Elwak when those on board came under gun attack.
The driver managed to drive through but the attack left two Kenya Police Reservists and the acting Officer Commanding Station injured.
The victims were admitted to a local hospital with multiple injuries, police authorities said.
On Monday, the group staged two attacks targeting civilians travelling on trucks and killed three people before kidnapping three others, police said.
At Falama the terrorists hijacked a construction truck, kidnapped the driver and his crew before torching it while at Jabibar, the terrorists hijacked another lorry with five occupants before killing three and sparing the female passenger.
One Al-Shabaab militant was killed after the lorry that was carrying miraa ran over them. This was after the gang tried to stop it.
The driver later overturned few meters ahead enabling the gang to catch up with them, police said.
The particular group kidnapped the lorry driver. Those abducted are yet to be found but teams of security agents had joined the hunt on them.
The incidents come in the wake of a campaign mounted in the area by Governor Ali Roba, EAC Cabinet Secretary Adan Mohamed, local senator and a host of Members of Parliament against Al-Shabaab.
Regional Commissioner Nic Ndalana was also present in the two-day campaign in the area.
The leaders said Al-Shabaab remains the greatest enemy of development in Mandera and urged the locals to help security agents to tame them.
North Eastern police boss Rono Bunei said more personnel had joined in the hunt on the gang that is operating in the area and harassing motorists.
There are concerns the persistent attacks are grounding operations in the region. Transport has been grounded as there is little movements in fear of attacks.