A suspected bomb blast ripped through a bus stop in central Bangkok Sunday, leaving at least nine people injured and reigniting tensions two months after the end of deadly opposition protests. The explosion came hours after polls closed in a closely watched by-election in the capital pitting a leader of the "Red Shirt" anti-government movement against a member of the elite-backed ruling party. The blast occurred at a bus stop in front of a Big C Ratchadamri supermarket, in the same central shopping district occupied by the Reds during their mass rally which ended in May, Police Colonel Saravut Jindatham told a foreign news agency.