A circuit board fragment, allegedly found embedded in a piece of charred material, was identified as part of an electronic timer similar to that found on a Libyan intelligence agent who had been arrested 10 months previously, carrying materials for a Semtex bomb. The timer allegedly was traced through its Swiss manufacturer, Mebo, to the Libyan military, and Mebo employee Ulrich Lumpert identified the fragment at al-Megrahi's trial. Mebo's owner, Edwin Bollier, later revealed that in 1991 he had declined an offer from the FBI of $4 million to testify that the timer fragment was part of a Mebo MST-13 timer supplied to Libya. On 18 July 2007, Ulrich Lumpert admitted he had lied at the trial.[49] In a sworn affidavit before a Zurich notary public, Lumpert stated that he had stolen a prototype MST-13 timer printed circuit board from Mebo and gave it without permission on 22 June 1989, to "an official person investigating the Lockerbie case".[50] Dr Hans Köchler, UN observer at the Lockerbie trial, who was sent a copy of Lumpert's affidavit, said: "The Scottish authorities are now obliged to investigate this situation. Not only has Mr Lumpert admitted to stealing a sample of the timer, but to the fact he gave it to an official and then lied in court". Traces of high explosives RDX and pentaerythritol tetranitrate (PETN) were found in close proximity to the explosion.