Aviation authorities have refused to extend an international safety certificate for Bangkok's new international airport, a senior official said Saturday, dealing another blow to the problem-plagued facility. With runway and tarmac repairs at Suvarnabhumi airport still under way, the Department of Civil Aviation decided Friday not to renew its interim safety certificate, which expired a day earlier. The airport can, however, continue to operate without the license. Somchai Sawasdeepon, the airport's general manager, said the airport also has yet to set up a safety committee as required by the International Civil Aviation Organization because authorities are "busy resolving others problems." The issue will be discussed at the next board meeting, Somchai said, adding that he was confident the certificate will be renewed after the safety committee has been established.