Bukit Aman Commercial Crimes Investigation Department chief Amar Singh has vowed stern action against officers who raided the fridge of one of former premier Najib Abdul Razak's children, if such allegations are true.

"On the allegation that 'food was demanded to be prepared and police personnel eating chocolates and food from the fridge', I request that more details be provided on such incident that took place (sic) and also identify, if possible, the police personnel who are involved.

"I will not tolerate such unprofessional conduct and stern action shall be taken against the personnel concerned in contravention of our police standard operating procedures, if the allegations are found to be true," Amar Singh said in a statement tonight.

He was responding to complaints raised by Najib's lawyer Harpal Singh Grewal regarding the conduct of officers searching condominium units belonging to the former premier's children.

Amar said he had reminded all officers involved in the searches to be professional and to treat the occupants with the utmost respect as the premises were occupied by the former prime minister and his family.

Meanwhile, Amar Singh also said that he had instructed his officers not to bring their phones with them during the searches to ensure that there are no leaked photographs that can result in a "trial by electronic media".

As such, he asked for details of any suspected leaked photographs from the search in order to verify if the images had come from the police or otherwise "as there were family members and friends present during the search."

Earlier today Najib's wife Rosmah Mansor through her lawyers issued a statement urging police to plug any leaks with regards to the probe.