Two men have been arrested by detectives investigating the attempted murder of three police officers on a busy coastal path in Northern Ireland.
Two policemen and one policewoman were only metres from a bomb when it exploded on the Duncrue towpath in north Belfast last month.
Forensic experts have been examining whether the device detonated fully.
The officers, who had been responding to a call-out, escaped injury.
There had been two previous call-outs to police earlier in the day alleging a crime had been committed on the towpath and police are investigating whether the officers were lured to the scene of the bomb.
Commanders described it as a "sophisticated and well-planned attempt to kill".
The suspects, aged 23 and 42, were detained in the north Belfast area by detectives from the Police Service of Northern Ireland's serious crime branch.
They have been taken to the serious crime suite at Antrim police station for questioning.
As part of the police operation a number of searches were also carried out in north Belfast.