Swedish Prime Minister Goeran Persson has said Thailand should explain why its seismologists failed to warn anyone of last month's killer tsunami if it wants tourists to return, Radio Sweden reported on Monday.
Persson, now on a two day visit to Thailand with the leaders of Finland and Norway, also said hotels and resorts devastated by the waves needed to be better built in order to withstand such punishing natural forces in the future.
He said Indian Ocean countries need to put up a tsunami warning system quickly and reconstruct hotels with high safety standards if they want tourists to return.
"That is the demand if there should be a new huge wave of tourists coming back," Persson said.
He told reporters that he expressed directly to the Thai authorities that he wants to see an investigation about the warning for the catastrophe.
"We want to see an investigation about the warning of the catastrophe," he said, adding that "The earthquake came a long time before the tsunami. Why wasn't there a warning? Who was responsible for that?"
Thailand launched an investigation within days of the tsunami, which killed more than 5,300 people in the country -- half of them foreign tourists. However, no date has been set for a report.
The Swedish prime minister and his Nordic counterparts also viewed the refrigerated containers storing what authorities believe to be the remains of some 900 foreigners killed in last month's tsunami.
Thailand's leading forensic expert briefed them about the work of hundreds of Thai and international scientists to identify more than 2,000 bodies stored at the Yanyao Buddhist temple that has served as a morgue since the tsunami hit.
Persson said he was impressed and extremely humbled because the experts are doing a very difficult job under very difficult circumstances.
Fifty-two Swedes died in the disaster, 637 are confirmed missing and a further 893 are unaccounted for.
Persson said the final toll may be anywhere between 700 to over 1,000.