Al-Shabaab militants Flee key town as Somali army Advances
Gunmen, who drove in two vehicles drove past a local church engaging in shooting, injured the three victims before police responded.
They then dropped two explosives which are believed to be grenades as they drove out.
OCPD Isaiah Odhiambo says they are now in control of the situation and they are hunting down the gunmen.
The attack comes days after terrorists attacked Westgate Shopping Mall killing at least 72 people.
The area has been a target of similar attacks in the past.
More officers have been taken to the region to beef up security.
Interior minister Joseph Ole Lenku said security has been tightened across the country to ensure safety of the people.
Sources say that the United States and Turkish forces based in the capital Mogadishu have bombed Al-Shabaab's defensive bases from the air, which forced the militants to flee.