Three persons who stormed into the President's House at Fort on July 9 during protest, had been arrested with 40 gold-plated brass sockets that were fixed on the walls to hang window curtains.
The Welikada Police arrested the suspects while attempting to sell the stolen items yesterday.
Police launched investigations after a number of items at the President's House was stolen following the protesters took control on the palace on July 9.
The arrested three suspects, aged 28, 34 and 37, were residents of Obeysekarapura in Rajagiriya. Police said the suspects were suspected drug addicts.
They will be handed over to the Colombo (North) Criminal Investigation Division, which is handling the investigations of the incidents.