GUWAHATI, India, Nov 6 (Reuters) - India tightened security along its long and porous frontier with Bangladesh on Monday after officials said they suspected involvement of foreigners in blasts that killed 12 people in the northeastern state of Assam. Officials have blamed the separatist United Liberation Front of Asom (ULFA) for the two bomb blasts on Sunday in the state's biggest city Guwahati, but said the rebels could have been backed by Islamist militants in neighbouring Bangladesh. The attacks were the biggest since the Indian government ended a truce with rebels of the ULFA in September and called off peace talks, after which there has been an increase in violence in the state. "We suspect not only ULFA but also think some external forces are trying to indulge in subversive activities in the state," S. Kabilan, Assam's most senior bureaucrat, told Reuters. "We are looking into the possibility of involvement of some jehadi elements in last night's blasts," he said. One bomb went off in a crowded market in the heart of Guwahati, the main commercial centre in the volatile northeast, while another exploded outside an oil installation. About a dozen people were wounded. New Delhi has for long accused Dhaka of giving refuge to rebels from the northeast and also of allowing them to run camps on Bangladeshi soil. Bangladesh, which itself faced a wave of bomb attacks blamed on Islamist militant groups last year, denies it has sheltered anti-India guerrillas. Indian officials said an emergency meeting of the Unified Command Council -- a group which includes the army, federal and state police forces -- had been called on Monday to review security and tackle the spike in violence in Assam. Life in Guwahati, a city of about one million people, appeared normal on Monday despite the blasts. A call by local groups for a general strike in protest against the blasts evoked a poor response as schools and businesses opened and transport services operated as usual. The ULFA has been fighting for an independent homeland for Assamese people for nearly three decades, accusing the federal government of plundering the region's natural resources.
