Police are investigating damage caused to 30 cars parked in a mainly Protestant area of Londonderry at the weekend.
The cars parked in the Irish Street area were vandalised sometime between 0130 and 1000 BST on Sunday.
DUP MLA William Hay said he believed it was a sectarian attack.
Sinn Fein councillor for the Waterside Lynn Fleming said those responsible did not represent the Nationalist community.
Alison McMorris, who had her car damaged in the attack, said the attack was a "disgrace".
"Thousands and thousands of pounds of damage has been done. How can we have peace when we have this going on?" she said.
"I do believe it was ones from the other side, the top of the hill.
"They've damaged their own up there, burning wheelie bins and everything else.
"It's innocent people, hard working people they have done the damage to this time."
Mr Hay said this was not the first such incident.
"There have been ongoing attacks within the area where people are coming into the area late at night and leaving like thieves," he said.
"It seems to have all the hallmarks of a sectarian attack."
Councillor Flemming said residents in Nationalist areas of the Waterside were also suffering.
"There have been a number of incidents in our own area directed at local residents," she said.
"Unfortunately, there has been a small group causing absolute mayhem.
"These people are not representative of the community."