The Sri Lankan government officially pulled out of a defunct truce with the rebels last month.
The Tamil Tigers have been fighting for more than three decades for an independent ethnic homeland in the Sinhalese-majority island.
Fighting between the military and LTTE rebels has intensified since the government scrapped a six-year ceasefire pact last month.
The government said the rebels had used the truce to re-arm.
According to the military's latest announcement, more than 1,100 LTTE separatists, and more than 55 government soldiers and police, have been killed so far this year.