A controlled explosion was carried out on an object at St Mary’s on the Hill church on the Carnmoney Road, while an alert at the Church of St Mary, Star of the Sea, at Whitehouse Newtownabbey was also resolved.
Councillor Billy Webb said: “No place of worship should ever be subjected to any attack. This thuggish behaviour directed towards these two well-known churches will not be tolerated.
“I, along with the community, am shocked and horrified at these actions and our thoughts are with all who continue to worship there.
“This campaign of intolerance must be brought to an end quickly and I would urge anyone with information to contact the PSNI as soon as possible so that those responsible may be dealt with before the courts.”