GUWAHATI, India, Jan 6 (Reuters) - Suspected separatist rebels killed at least seven people, four of them policemen, with an explosion in India's troubled northeastern state of Assam on Saturday, officials said. An improvised explosive device blew up a government vehicle carrying policemen and officials in the attack in Karbi Anglong district's Diphu town -- about 270 km (170 miles) south of Guwahati, the state's main city. The blast followed a series of coordinated overnight strikes by rebels in three different districts that has left 48 people, mostly labourers, dead. Though no militant group has claimed responsibility for the attacks, police believe the state's most powerful separatist group, the United Liberation Front of Asom (ULFA) -- which is fighting for Assam's independence from India -- is behind the violence.
