Surat, May 04: Irate mob of weavers set afire a Gujarat State Transport Corporation bus in Limbayat area of the city here today, even as anti-CENVAT stir entered its 34th day, police said. According to police sources here the mobs stoned two state transport buses in Salabatpura area in the heart of the city. Earlier, two more buses were also targetted by the mob in city outskirts of Mini-Saurashtra late last night. The situation was tense but under control, police said.