In a statement shared on his social media platforms, Sonko appealed to the public to assist authorities by sharing any credible information about Onsomu's whereabouts.
He said the cash reward would be given to any individual whose tip successfully helps law enforcement officers locate and arrest the wanted political figure.
Sonko assured members of the public that all information received would be handled with complete confidentiality to protect those who come forward. He also shared contact details through which people can submit reports or provide leads to investigators.
The announcement quickly generated widespread attention online, with many Kenyans discussing the unusual public appeal and speculating about the circumstances surrounding the search for Onsomu.
Despite the growing interest, the reasons behind the manhunt were not immediately disclosed in Sonko's statement.
This prompted some social media users to seek further clarification, while others encouraged members of the public with relevant information to cooperate with authorities.
The reward offer has intensified public interest in the case, with many closely monitoring developments to see whether the incentive will help investigators trace and apprehend the wanted official.
As attention continues to build, the outcome of the search is expected to attract significant public and political interest in the coming days.
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