MIAMI — The hacker group Anonymous has declared a cyberwar against the City of Orlando, disabling Web sites for the city’s leading redevelopment organization, the local Fraternal Order of Police and the mayor’s re-election campaign.

Anonymous, a large yet loosely formed group of hackers that claimed responsibility for crashing the Web sites of MasterCard and the Church of Scientology, began attacking the Orlando-based Web sites earlier this week.

The group described its attacks as punishment for the city’s recent practice of arresting members of Orlando Food Not Bombs, an antipoverty group that provides vegan and vegetarian meals twice a week to homeless people in one of the city’s largest parks.

“Anonymous believes that people have the right to organize, that people have the right to give to the less fortunate and that people have the right to commit acts of kindness and compassion,” the group’s members said in a news release and video posted on YouTube on Thursday. “However, it appears the police and your lawmakers of Orlando do not.”