When the link between PT/35(b) and MEBO was finally established in the fall of 1990, the Police investigators decided to go to Zurich and meet the owners of the company. Little did they know that their investigation was being interfered with.
In early September 1990 members of the Scottish Lockerbie inquiry team, together with officers of the British Security Service, were making arrangements to travel to Switzerland. Their intention was to meet members of the Swiss Police and Intelligence Service. The purpose of the meeting was to take forward a line of inquiry suggesting that the company MEBO might have been the manufacturers of the MST 13 timing device. Such a device had already been identified as forming part of the improvised explosive device responsible for the destruction of Pan Am 103.
Prior to the departure of these officers a request was made by the CIA to the British Security Service to deter or delay the members of the Scottish Lockerbie inquiry team from making the visit. This was request was refused and the visit proceeded as planned. Separately, officers of the CIA met with the Swiss Police and Intelligence Service on the day before the visit made by the Scottish Lockerbie inquiry team and the British Security Service.
This information is quoted verbatim from this document.