Latest: Letter bomb that exploded at French office of IMF was like a 'big firecracker'

Latest: The homemade explosive was like a "big firecracker" and sent by regular mail, said Paris police chief Michel Cadot.

Update 1.10pm: The homemade explosive was like a "big firecracker" and sent by regular mail, said Paris police chief Michel Cadot.

He said the IMF office had received threatening phone calls in recent days but they were not necessarily linked to Thursday's incident.