A viable device at the centre of a security alert in Crumlin, Co Antrim, was a "clear attempt to kill police", a senior officer has said.
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A primary school was among a number of properties which had to be evacuated on Wednesday after a bomb was found at an unmanned police station in the Mill Road area.
Crumlin Integrated Primary remained closed for a second day following the incident.
The device was removed by the Army bomb squad for further examination.
It is believed to have been a sophisticated device with a tripwire leading from it.
Area Commander for Antrim, Chief Inspector Simon Walls, said: "This was a viable device which was clearly meant to hurt or kill officers who are serving the local community.
"The actions of those who planted this device go beyond reckless. This was left in an area which is close to a primary school - if this had exploded we could now be dealing with injuries or fatalities."
He added: "The criminals who left this device have no regard for any member of the Crumlin community.
"The security alert brought the whole area to a standstill, caused a frightening situation for young children and left parents worried and concerned about the safety of their kids."
Police believe the bomb was planted sometime between Monday night and Wednesday morning.
They are particularly keen to speak to anyone who noticed any unusual activity around Crumlin United football pitch.
PUP representative Ken Wilkinson says more needs to be done to make unmanned police stations secure across the region.
"A sophisticated device was left here with, I believe, some kind of tripwire attached, so that whoever entered the police station - and that could have been police or people carrying out maintenance... It could have been set off by anything including a cat prowling about", Mr Wilkinson told UTV.
"Those who did this do not care about anyone in the community whatsoever."
A local SDLP MLA believes there needs to be more robust action against pipe-bombers.
"The police really need to step up to the mark here and get people arrested, sentenced and put away. If people are absolutely intent on causing trouble and disruption, then I believe they need to be taken out of society and put in jail", Thomas Burns told UTV.
Crumlin Integrated was the third school affected by security alerts in the Antrim area this week.
St Comgall's Primary was evacuated on Monday after a pipe bomb, believed to have been planted by the Real UFF, was picked up by an eight-year-old pupil in the playground.
Also on Monday, children were evacuated from St Joseph's on the Greystone Road after a telephone bomb warning - but nothing suspicious was found.
© UTV News