(Updates with fresh quote, details)

By Ranga Sirilal and Shihar Aneez

COLOMBO, Jan 8 (Reuters) - A Sri Lankan minister was critically injured and undergoing surgery on Tuesday after his vehicle was targeted by a roadside bomb north of the capital, hospital officials said.

Nation Building Minister D.M. Dassanayake's car was hit by a blast, which bore the hallmarks of a Tamil Tiger rebel attack, in the town of Ja-Ela, 12 miles (19 km) north of Colombo.

Local television broadcast footage of the ministers' Toyota Land Cruiser, its windows shattered, sides peppered with shrapnel sprayed by the Claymore fragmentation mine and blood smeared on a rear passenger door and in a pool on the ground.

"He is critical," Dr. R.M.M Rajamanthree, director of the government teaching hospital in the nearby town of Ragama, where the minister was being treated, told Reuters.

A nurse at the hospital said the minister had been taken to the operating theatre.

Hospital and military officials said 11 people in total were admitted following the bombing.

The blast is the latest in series of attacks on government officials and the military in recent months, and comes just days after the government said it was formally scrapping a tattered ceasfire which degenerated into renewed civil war in early 2006.

The Liberation Tigers of Tamil Eelam (LTTE), who want to carve out an independent state in north and east Sri Lanka, were not immediately available for comment, but routinely deny involvement in such attacks.

"This is definitely by the LTTE," said a military spokesman, declining to be named in line with policy.

The Colombo stock market <.CSE> deepened losses following the news of the blast, and was down 2.6 percent at the midsession.

The blast came minutes before Prime Minister Ratnasiri Wickramanayake announced parliament had again extended emergency rule first imposed in late 2005 after the assassination of the island's foreign minister.

The military says it has killed nearly 100 Tiger rebels since advising mediator Norway last week it was pulling out of the ceasefire pact, a move that has shocked the international community and is seen ruining any hope of resurrecting peace talks to end a 25-year civil war any time soon.

Just minutes before the blast, which took place on the main road between the island's only international airport and the capital, Deputy Tourism Minister Faizal Mustapha impressed on reporters that Sri Lanka was a safe tourist destination.

The government has vowed to wipe out the Tigers militarily, setting the stage for what many fear will be a bloody battle for the north as a death toll of around 70,000 people since the war erupted in 1983 climbs daily. (Writing by Simon Gardner; Editing by Alex Richardson)

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