SDLP Policing Board member Conall McDevitt said the murder bid was a "cynical and deplorable act".
Those seeking to target police officers are undermining not only the stated will of the people of Ireland who have long since rejected violence, but also the desire for a new beginning for policing in the North, which is shared by the majority of citizens.
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Hundreds joined the party for Jerika Bolen, 14, who has decided to come off life support and allow herself to die later this year.