Oksana Grigorieva Receives Threatening Calls

7/14/2010 12:00 PM PDT
TMZ has learned Oksana Grigorieva received threatening phone calls Tuesday that "scared her to death."

Sources tell TMZ at least one of the calls "could be interpreted as a death threat." 

We're told there were multiple calls and at least two appeared to be from the same caller.  We're told the callers were angry about her accusations against Mel Gibson.

And, sources say, the LAPD has been contacted.