Britney Spears has been receiving frightening letters and packages from a stalker. The singer was left so shaken by a pair of letters, containing “threatening language and weird gibberish” and describing how to make explosives, that she has handed the information over to the FBI.

“A lot of the things she was receiving were disturbing stalker kind of stuff. So, to be safe, her security team is turning it all over to the police and FBI,” a celebrity informant reveals to E! News.