The LTTE, or the Liberation Tigers of Tamil Eelam, are commonly known as the Tamil Tigers. They have fought for an independent homeland for the country's Tamil minority since 1983 in a civil war has left more than 65,000 people dead.
In recent days, the military has made significant progress in its campaign to recapture rebel strongholds.
Earlier this month, troops regained control of the northern town of Elephant Pass, the point at which mainland Sri Lanka links to the northern Jaffna peninsula. It had been in rebel hands for more than nine years.
The re-capture enabled the government to use a highway linking the mainland to the peninsula to move troops and supplies. Previously, it was done by air and sea