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Police investigating Justin Bieber fan

A Justin Bieber fan is facing questioning by cops in California amid allegations she made death threats against the singer's ex-girlfriend.

Detectives at the Los Angeles Police Department obtained a search warrant to investigate a 14-year-old girl from Kentucky who is said to have posted menacing messages about Bieber's ex Caitlin Beadles on social media website Tumblr.com.

Using the online handle KillSGandCB, the unidentified teen allegedly threatened to "murder" Beadles, claiming she wouldn't know what's coming until she "wakes up on the other side of her bed with a knife".

According to TMZ.com, LAPD authorities contacted her mum and ordered her to closely monitor her daughter's internet activity.