'Bullet' package sent to Neil Lennon at Celtic Park
Strathclyde Police are investigating a suspicious package which has been found at Celtic Park.
BBC Scotland understands the parcel, discovered at the club's stadium on Thursday morning, contained a bullet.
It was addressed to Celtic manager Neil Lennon but was not opened and police were informed.
The incident is not being linked to the arrest of two men by police probing parcel bombs sent to Lennon, two high-profile fans and a republican group.
The Celtic manager was also the target of an alleged assault during his side's 3-0 win over Hearts and Tynecastle on Wednesday.
Following the developments, Celtic chief executive Peter Lawwell, said the attacks and threats made to Lennon brought "shame on Scottish football".
He said: "Apart from last night's events, this week alone we have seen seven people arrested at our training ground following an alleged firearms incident and I can also confirm that this morning another package arrived at Celtic Park which appears to contain ammunition.
"This has been removed and taken by police for further forensic tests. We are the only club to be the subject of such vile, sustained and relentless attacks."
The club's chief executive said Celtic and its staff were being subjected to an "intolerable" and "ongoing campaign of hatred and intimidation".
He added: "This is Scotland's shame and it is high time Scotland addressed it."
Lawwell paid tribute to his manager, who he said had "displayed a strength of character and resilience" in the face of "prejudice and violence" that he had endured as a player and manager since moving to Scotland a decade ago.