Terry Spence, chairman of officers' representative body the Police Federation, said the device was planted by "cowardly thugs":
This was an attempt to murder an off-duty police officer.
But this attack is no great surprise. Scores of police officers have been forced from their homes in the last 12 months because of terrorist incidents. This is just the latest of many.
It reinforces the need for officers to be extra vigilant.
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Elsewhere, a cloudy and very mild night.