Interior and Coordination Cabinet Secretary Dr Fred Matiang'i addresses the press flanked by other security officials, January 31, 2018. [Photo/Citizen TV Kenya]

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The government has launched investigations into Tuesday's controversial swearing-in of opposition leader Raila Odinga.

Interior and Coordination Cabinet Secretary Dr Fred Matiang'i said they would not spare anyone who will be found to have been linked to the inauguration which was held at Uhuru Park grounds.

He said NASA principals, Odinga, Kalonzo Musyoka, Moses Wetangula and Musalia Mudavadi would not be spared either, but would also be investigated.

"Furthermore, the government has commenced full investigations around the purported 'swearing-in' of Raila Odinga. The investigations will extend to co-conspirators and facilitators," he said on Wednesday, adding that legal action would be taken upon completion of the investigations.

Addressing the press at Harambee House, Matiang'i indicated whatever happened on Tuesday was "a well choreographed attempt to overturn or overthrow the legally constituted government of the Republic of Kenya."

He addressed the press moments after Ruaraka MP T.J Kajwang was arrested for administering oath to Odinga.

The controversial inauguration saw Odinga read the oath presided over by High Court Advocate (Ruaraka MP) Tom Kajwang, and in the presence of Senior counsel (Siaya senator) James Orengo, and lawyer Miguna Miguna, a former Nairobi gubernatorial candidate.

Constitutionally, the president of Kenya should take oath of office in a ceremony presided over by the Chief or Deputy Chief Justice, and administered by Judiciary Chief Registrar.

“I thank you for the respect you’ve shown by turning up for today’s ceremony,” Odinga told thousands of supporters at Uhuru Park.

His deputy Kalonzo Musyoka and fellow NASA principals Musalia Mudavadi and Moses Wetangula were missing.

"Today is an historic day in Kenya. Kenyans have taken a step of getting rid of a dictatorship that came through vote rigging," said Odinga, in a ceremony that lasted less than 60 seconds.