Suspected rebels bombed an oil pipeline in India's troubled northeast on Sunday while police fired on tribal activists blocking highways as part of a campaign for a separate homeland, police said, according to Reuters. Police said four guerrillas had overpowered security men guarding the oil pipeline in Assam state before fixing a bomb to it. There were no reports of injuries to people but the blast killed cattle and caused a fire which damaged homes. "There was a big fire immediately after the blast and several houses nearby caught fire," a local police officer said by telephone. An oil industry official said the region's four refineries had sufficient stocks to last for more than a week, and that the damaged pipeline would be repaired within two days. Police said the separatist United Liberation Front of Asom (ULFA) was behind the blast. On Saturday, its rebels threw grenades into a crowded market in Guwahati, the region's biggest city, wounding two civilians.