A middle school student is being kept home in fear of her life after anonymous Instagram users threatened to stab her to death. The girl, who has not been named but attends school in San Dimas, California, is the target of disturbing posts on the photo-sharing service. The posts consist of pictures of her accompanied by threatening messages. One says: 'That smile! I can't wait till its [sic] just blood and tears'. Threats: The above pictures, which showed the girl's unobscured face, were posted on Instagram along with violent messages . Another reads: 'You show up at school tomorrow thats the end of you. I got knifes that ill bring and youll get to pick' [sic] . Since the threats began at the start of this week, the girl, who attends Lone Hill Middle School in San Dimas, has been kept home by her mother. Deputies from the Los Angeles County sheriff's department are helping to guard the girl. They say nobody else is in any danger, but have increased their presence at the school as a precaution. Investigators believe the threats originate from other school children - though it is unclear whether one or several people are to blame. Taunting: One post picks up on a local media story about the situation, and reaffirms its commitment to . Staying home: The student is keeping her distance from Lone Hill Middle School in San Dimas, California . According to local news station KTLA, the posts are being removed by Instagram as they are reported, but keep cropping up. Detectives said the social network is co-operating with their hunt, but that pinning down whoever is responsible has proved time-consuming. Indeed, the poster appears to have been spurred on by local news reports. A more recent entry reads: 'Enjoy your fame on the news... your life is very short sweetheart, this is your last week. Times up!!!' [sic] . The sheriff's department is yet to arrest anybody.
Unnamed girl was targeted by threatening posts on social network .
Was taken home from Lone Hills Middle School in San Dimas, California .
Investigators believe fellow students are posting the threats .
In one message a user threatens to bring a knife to school and stab the girl .