Liberal candidate Bob Rae is the latest victim in a string of vandalism attacks targeting supporters of the Liberal party over the weekend in Toronto.

Rae, a former Ontario premier, took to social media to announce his vehicle had been damaged by vandals.

"Our front left tire slashed this morning...not nice," Rae tweeted on Saturday night. Rae said he doesn't blame any political party for the damage, but that the attacks are "just bad people up to no good."

Rae said that there have been too many attacks and that they are not good for the country.

Prime Minister Stephen Harper condemned the attacks Sunday.

"I'll just tell you we suffer acts of vandalism and these sorts of things as well," he said in British Columbia. "None of them are acceptable. They should not happen in a campaign."

Police have investigated over two dozen complaints that Liberal party supporters with campaign signs on their lawns have been targeted by vandals in downtown Toronto since Thursday.

The only evidence investigators have is a grainy image of a suspect who was captured on a security camera in the St. Paul's riding Thursday evening. The suspect is described as a white male wearing a dark leather jacket, blue pants and a white baseball cap.

Police say that in the St. Paul's riding, as many as 16 cars were scratched and had tires punctured between 10 and 11 p.m. on Thursday in the areas of Soudan and Hoyle avenues, near Mt. Pleasant Road and Eglinton Avenue East.

About 80 per cent of the homes targeted were displaying lawn signs promoting Carolyn Bennett, the Liberal incumbent in the St. Paul's riding.

On Saturday, Liberal supporters in Toronto's Trinity-Spadina riding say they woke up to more signs of vandalism.

Residents at homes displaying signs supporting Liberal candidate Christine Innes had their tires slashes overnight in areas north of College Street, between Ossington Avenue and Avenue Road.

Police say that six vehicles were targeted in the Bloor Street West and Bathurst Street area, between 8:00 p.m. and 11 p.m. on Friday evening.

Paul Allan, a resident who is supporting Bennett in St. Paul, said he is convinced that his tires were flattened for political reasons. "I really do feel it is something a little bit more sinister. Not conspiracy, mind you, but definitely a little bit more sinister than the average prank," he said.

Judy Keeler, another Trinity-Spadina resident, said the attacks are very vicious.

"The fact that they're targeting people not because of the way they vote but (against) a Liberal frame of mind, is very dangerous to our society," she said.

Both the NDP and the Conservative candidates in the St. Paul's riding have spoken out against the vandalism.

A city councillor has suggested that residents in the St. Paul's riding park their vehicles on the street overnight until 8 a.m. until May 2, to avoid further acts of vandalism. He said that if a car is ticketed, his office will cover the cost.

This isn't the first time Liberal supporters in St. Paul's have seen such attacks. At least 25 homes in the riding were targeted during the 2008 federal election, with vandals cutting off phones and cable lines, spray-painting property and cutting brake lines on a number of vehicles.

Anyone with information regarding this incident is asked to contact police at 53 Division at 416-808-5300 for the St. Paul's riding, 14 Division for Trinity-Spadina at 416-808-1400 or Crime Stoppers at 416-222 TIPS (8477) or online at www.222tips.com.

With files from CTV Toronto's John Musselman.