Police in the North are continuing to question three men in connection with the attempted murder of a police officer in East Belfast on Sunday.
A 41 year old man was detained in West Belfast yesterday - while two other men, aged 34 and 25, were arrested on Monday.
The PSNI says the bomb - which was found under the officer's car - as he was about to take his family to Sunday lunch - was intended to kill.
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Dissident republicans are being blamed.