Four men and one woman are due to appear at Glasgow Sheriff Court tomorrow charged with alleged terrorism offences and conspiracy to murder.
The arrests are linked to the "activities of individuals sympathetic to dissident Republicanism, but who are not affiliated to any specific group", Police Scotland said.
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The device was found outside the gates of Holy Cross Boys' Primary School in Belfast.
The Liberal Democrat leader has been attacked after he refused to say that he does not believe gay sex is a sin.