Demonstrators yesterday besieged the Royal Thai Police Office (RTPO) headquarters on Rama I Road and defaced the building name sign on the first day of the state of emergency.
About 500 demonstrators, led by the Network of Students and People for Reform of Thailand (NSPRT), an ally of the People's Democratic Reform Committee (PDRC), gathered in front of police headquarters with two six-wheel trucks equipped with loudspeakers blocking the entrance to the office.
Protest leaders, including Nititorn Lamlua and Ratchayu Sirayothinpakdi, lambasted national police chief Adul Saengsingkaew for serving as the deputy director of the Centre for the Administration of Peace and Order (Capo).
They offered a cash reward for the arrest of Pol Gen Adul and asked all police to stop serving the caretaker government.
Disgruntled demonstrators removed the letters spelling the RTPO building name before spray-painting the words "NSPRT" in sky blue. They also spray-painted other messages, one of which read "the office of national takuad (water monitor)".
Some demonstrators cut off chains from the gate, but no one went inside the police headquarters compound. The protesters later left the venue.
At the PDRC's rally stage in Lat Phrao, demonstrators organised a "big cleaning" activity in the area, starting from the main road at Lat Phrao intersection to an area in front of the headquarters of the Thai Military Bank, covering a distance of about 400 metres.
The Bangkok Metropolitan Administration's (BMA) Chatuchak district office sent cleaners and water trucks to help.
Protest leader Issara Somchai, who organised the activity, said officials from the Fisheries Department where his group had earlier cut off the electricity supply yesterday asked his group for power to be restored to keep rare fish in aquariums alive.
He agreed to reconnect the power supply for the fish. However, electricity in other areas remained cut off.
The Civil Aviation Department yesterday agreed to the protesters' demand that only essential staff be permitted to work at the department.
Speaking after talks with protest bosses, department chief Woradej Harnprasert said it was agreed officials working on three main tasks would be allowed to continue their work. The tasks were issuing aviation licences, safety inspections for aircraft and pilots and search operations for aircraft facing problems.