Kris Jenner has reportedly decided to increase security at her Hidden Hills home after receiving multiple death threats directed toward her and daughters Kendall and Kylie Jenner.

The FBI is aware of the issue and executed a search warrant Friday on a hotel room in Beverly Hills from which a woman has reportedly called the "Keeping Up with the Kardashians" star up to 300 times a day to threaten her.

According to TMZ, among other things, the woman was threatening to release a sex tape starring Jenner and her husband Bruce.

"Bruce and Kris made the decision to get the FBI involved after the threats escalated and included very specific information about threats made against Kendall and Kylie," a source told Radar Online. "This is being taken very seriously and Kris has dramatically increased security at her Hidden Hills compound."

The woman said she was questioned about her Internet use and about whether she had been the author of the threats against the reality TV stars.

"They told me it was about Kris Jenner and her [accounts] being hacked, her email being hacked, her iCloud being broken into and getting crank calls," she said. "I was flabbergasted."

Insiders say Kim Kardashian and Kanye West "insisted that they pay for the added security."

"Not only because they also live at the house with their daughter, North, but because they will do anything for Kris," said the source.

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No arrests have been made so far.