Fears have mounted that a fresh campaign of attacks could erupt across Northern Ireland this summer following an upsurge in both loyalist and dissident republican violence.
The concern comes after a mortar was fired at a PSNI station in Londonderry and a top loyalist was murdered in Belfast within 24 hours of each other.
Reports had suggested that the failed mortar bid on Strand Road police station on Friday night could lead to heightened security across the province.
Oglaigh na hEireann was reported to have claimed responsibility for the attack.
A Vauxhall Cavalier car was parked in Queen Street and what police described as “a mortar- type device” was fired from the rear of the car towards the police station shortly after midnight.
Nobody was injured in the incident but nearby residents, including a number of elderly people, were evacuated from their homes.
And just hours before top loyalist Bobby Moffett was shot dead on the Shankill Road. Dozens of shoppers and bystanders were left shocked as Moffett (43) was shot a number of times in the face by two masked gunmen.
The murder has been blamed on renegade elements within the UVF. It is understood the murder was linked to a personal dispute.
Police described the shooting as “a cold-blooded, ruthless killing”.
A number of separate attacks have also raised concern of an escalation in dissident activity.
On Sunday a pipe-bomb was thrown into a house in Dungannon, Co Tyrone. A window was smashed and the device thrown inside, causing substantial damage to the kitchen.
Meanwhile two men, aged 29 and 30, were arrested in connection with an explosion in Strabane, Co Tyrone, last Thursday.
A pipe-bomb was thrown at a house in Springhill Park late that evening.