Police are investigating after it was reported a girl had cut her lip while eating a Curly Wurly bar that appeared to have a razor blade in it.
Libby Buisson, 14, from Laindon, had bitten into the chocolate which she is thought to have obtained while trick or treating near her home on Monday.
Essex Police said: “We are now investigating the circumstances around the report.”
The force has called for anyone with information to come forward.
Libby’s father, David Buisson, told the BBC they did not know how the blade got into the Cadbury chocolate bar or where it had come from.