"The officers used justifiable force to counter the violent protests, even as the youth pelted them with stones. Some of the protesters attacked police stations. You cannot injure an officer and expect him to be nice to you. He will use the gun and teargas on you, to defend himself," Koome said.
He said police officers remained professional as they protected life and property during the demos.
"We are warning opposition leaders against resuming protests. We will deal with them firmly and decisively. We will not allow what is happening in the neighbouring countries to happen in Kenya," Koome said.
Two weeks ago, Azimio leaders, Martha Karua, Kalonzo Musyoka, Eugene Wamalwa and Jeremiah Kioni, announced plans to take legal action against police officers they accused of using excessive force on protesters, resulting in injuries and deaths.
Karua said police officers who violated their constitutional duty to protect lives and property during protests would face the law.
The Kenya National Commission on Human Rights (KNCHR) reported that at least nine people were killed during last month's demonstration.
"We have instructed our lawyers to prepare and institute legal proceedings against police officers who have gone against their constitutional duty of protecting lives and property of Kenyans during protests," said Karua.
The Narc Kenya leader called citizens to document instances of police brutality and abuse and share the same with their legal team.
Azimio leaders said the responsibility for protecting Kenyans and their properties lies with the state and its agencies.
President William Ruto and his deputy Rigathi Gachagua have defended the police saying they would protect them from any move by the Opposition to sue them.
"Those who plan, fund and incite youth to carry out violent protests are the ones who are in the wrong. Violent protests are unconstitutional, illegal, undemocratic and unpatriotic," the President said.
"The police have done a commendable job in dealing with violent protestors. They require promotion," Gachagua said on Monday.
Stay informed. Subscribe to our newsletter