Police Inspector General David Kimaiyo told reporters it is "very clear that there is a limit" to media freedom, regarding reports on last month's four-day assault on the mall to oust Al-Qaeda-linked gunmen who carried out a shooting spree.
"We are looking within the law very closely for those individuals who in one way or another might have committed crimes... That soon they would be apprehended and appear before the court, and face the consequences of this," he said.
"You need not incite Kenyans, you need not to distribute or issue statements that can amount to hate speech, and you need not issue statements or reports that could affect the life of another person," Kimaiyo said.
Police sources today said a team had been tasked to bring in two KTN reporters for questioning.
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Kenya's National Commission on Human Rights said it was "concerned" at the police warning.
KTN said their hour-long documentary investigating the Westgate attack had "ruffled the feathers" of Kimaiyo.
Media reacted angrily to the move by the police chief, with the Daily Nation newspaper putting his threats on its front page under the headline "intimidation".
The Standard newspaper, which has the same owners as KTN, published a cartoon that shows a journalist silenced by a giant padlock through his lip marked "press freedom", as a government official walks away with the key.
Shop owners -- including a top-end jewellery store as well as others selling mobile telephones, watches, cameras, expensive suits and lingerie -- said their stores were completely looted.