The armed security operatives stationed their vehicles outside the secretariat.
Spokesman for the Ondo PDP, Kennedy Peretei, said the presence of the security operatives was to prevent a planned peaceful protest by youths of the party.
Peretei said the protest was for the youths to demand whereabouts of Governor Oluwarotimi Akeredolu after being absent from the State since April, 2023.
He said staff were not allowed into the secretariat.
The ruling All Progressives Congress(APC) on Sunday raised the alarm over plots by the PDP and some APC chieftains to instigate crisis in the state.
It said Governor Akeredolu would soon be back to the State.
The Ondo APC stated that Governor Akeredolu has been performing his official duties irrespective of location.