GUWAHATI, India, 23 Nov (Reuters) - One person was killed and about half a dozen people were wounded on Thursday when suspected anti-India rebels exploded a bomb outside a crowded railway station in the northeastern state of Assam, police said. The blast took place in a taxi parking lot near a military transit camp outside the train station in Guwahati, the biggest city of northeastern India. Police said they suspected the United Liberation Front of Asom (ULFA), which has been fighting for the freedom of Assam for more than two decades. The rebel group had warned it would target vital installations and security forces in the tea- and oil-rich state ahead of a "protest day" it has called on Nov. 27.