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A letter bomb which injured a woman may have been sent by animal rights extremists.
Police were called into DNA testing firm, Cellmark, at Abingdon in Oxfordshire after a small explosion.
The woman was treated at Abingdon Hospital and has now been discharged.
Officers say the name Barry Horne, a campaigner who died in 2001, was written on the back of the envelope.
The area has now been declared safe and detectives are investigating.
Nobody from the firm was available for comment following the incident.