Mathare MP Anthony Oluoch was on Sunday afternoon shot in the leg during running battles in Baba Dogo area in Nairobi.
Reports indicate that the Orange Democratic Movement (ODM) legislator was rushed to Nairobi Hospital for treatment.
The shooting came after four people were found dead with gunshot wounds in the area on Sunday morning.
Nairobi police boss Japhet Koome confirmed the incident adding that unknown assailants may have killed the victims.
He also denied allegations the attack was from tribal clashes maintaining that it was a case of mysterious killings.
Read Also: Tension in Nairobi As Gunmen Kill 4
Meanwhile, National Super Alliance (NASA) leader Raila Odinga addressed supporters at Riverside Ruaraka urging them to be calm. He accused the government of committing the killings.
The Police insisted that it was a regular crime.
On Friday, Kathiani Member of Parliament (MP) Robert Mbui was admitted to the Nairobi Hospital with a broken leg following the chaos that rocked the NASA leader's return to Kenya.
Mr Mbui is said to have suffered the injury as he joined other leaders as well as NASA supporters in marching into the city centre as they received Mr Odinga after his trip to the United States.
Reports indicate that the NASA Chief whip fell into a ditch while fleeing from police after his vehicle was smashed. His bodyguard is also reported to have been injured in the incident.