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Parcel bombs have been sent to Celtic manager Neil Lennon, a lawyer and a politician.
Strathclyde Police say the parcels were``designed to cause harm''.
They were sent to Lennon, Paul McBride QC and Labour politician Trish Godman
They were initially thought to be hoax packages but analysis has revealed that they could have worked.
A package addressed to Lennon was intercepted at the Royal Mail sorting office in Kirkintilloch on March 26th
Two days later, a parcel for Trish Godman was intercepted at her constituency office and on April 15th a package was intercepted en route to Paul McBride, who has represented Lennon at Hampden during his dispute with the SFA.
A police source said: ``They were viable devices designed to cause harm.
``We are treating the matter very seriously.''
Strathclyde Police are investigating and have offered safety advice to the intended recipients of the packages as well as to Royal Mail staff and workers in the mail room at Celtic.
It is the latest in a series of incidents targeting people linked with the football club.
Earlier this year packages containing bullets were sent to Lennon and to Celtic players Paddy McCourt and Niall McGinn, all three of whom are from Northern Ireland.
Mr McBride said he did not want to comment and neither did Ms Godman. It's reported she's been pictured wearing a Celtic top at the Scottish Parliament.
A spokesman for Celtic chairman, Lord John Reid, said the club had been kept fully informed on events and should be making a statement on the matter later today.