Four people were killed and five wounded on Wednesday when a bomb attached to a bicycle exploded in a bazaar in insurgency-hit southwestern areas of the country, police said. The blast in the remote town of Sibi was the latest in a series to hit the gas-rich province of Baluchistan, where separatist tribal rebels are waging a campaign for greater rights. "It was a remote controlled bomb fixed to a bicycle in the main bazaar of Sibi. Four people were killed and five wounded, three seriously," local police officer Mohammad Hussain told Agencies. Three of the victims were from a pro-government tribe and one was a passer-by," he said.