As Johnson spoke on the library steps, protesters at the encampment nearby appeared to pay little attention
The teams involved include the police forensic team, the fire department and the Atomic Energy Licensing Board, the Malaysian police said in a statement on Saturday.
The sweep will be conducted from 1 a.m. (1700 GMT) on Feb. 26, the police said.
Kim Jong Nam, the estranged half-brother of North Korean leader Kim Jong Un, was killed on Feb. 13 at the airport by VX nerve agent, classified by the United Nations as a weapon of mass destruction, Malaysian police said on Friday.