This morning a court in Belfast granted an extension to the detention of the four suspects, aged 22, 38, 45 and 47 years old until 10pm on Tuesday, February 28.
All five of the arrested men remain in custody in the Serious Crime Suite at Musgrave Police Station.
A fifth suspect was arrested on Saturday morning.
Major Investigation Team detectives continue to ask for the public’s help and would appeal to witnesses or those with information to please get in touch by calling 101 or online via http://www.psni.police.uk/makeareport/.
Information, including photos, CCTV and dash-cam footage, can also be provided to police through the Major Incident Public Portal at https://mipp.police.uk/operation/PSNI23S03-PO1
DCI Caldwell is fighting for his life in Altnagelvin Hospital.Police chiefs said on Friday the senior detective was “critical and sedated”.
Major Investigation Team detectives say the New IRA carried out the attack on DCI Caldwell who has been a police officer for 26 years.
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