A large group of protesters demonstrating at a May Day rally for worker's and immigrant rights downtown broke off into a riot vandalizing about a dozen businesses around 10:30 p.m. Saturday, police said.
Many in the group were carrying makeshift torches as they marched, breaking storefront windows and writing "anarchist graffiti" on buildings, according to Capt. Steve Clark. Many businesses sustained multiple broken windows including very large storefront windows at Urban Outfitters and The Rittenhouse building. Police believe at least 15 businesses suffered damage.