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The suspect package was intercepted at a mail depot in Northern Ireland by police investigating parcel bombs sent to Celtic manager Neil Lennon and two high-profile supporters of the club.
Officers are still looking for whoever was responsible for sending two parcel bombs to Lennon and one each to lawyer Paul McBride QC and former politician Trish Godman.
Last week Strathclyde Police said the two packages sent to Lennon, and the two others were ``designed to cause real harm to the person who opened them''.
The latest package - believed to be a parcel bomb - was found at the National Return Letter Centre in Belfast, which handles returned mail from around the UK.
It's thought it was addressed to Irish Republican organisation Cairde Na H'Eireann (Friends of Ireland) offices in Glasgow.
It is understood the parcel, the fifth to be intercepted, did not originate in Northern Ireland and had no links to the region.
Strathclyde Police believe the package originally entered the postal system at around the same time as the devices that are already under investigation.
Officers from the Police Service of Northern Ireland recovered the package and alerted the Scotland force.
The item was found on April 12 but army bomb experts later confirmed it was ``similar in nature'' to the packages being investigated by Strathclyde Police.
Tests and analysis will be carried out later this week in Scotland once Strathclyde Police receive the latest package.
It is understood the latest package was not addressed to a particular individual.
Chief Superintendent Ruaraidh Nicolson, of Strathclyde Police, said last night: ``This latest discovery will become part of the ongoing investigation. We'd like to stress that there is still no intelligence to suggest that these packages pose a threat to the wider public and we would urge people to remain calm.