'There won't be any fast and aggressive rate hikes like in other countries.' However, the rate is still 'low and probably the lowest' in Southeast Asia, which will help future investment, the central bank's Mathee Supapongse told a business seminar. The Bank of Thailand raised its main interest rate (THCBIR=ECI) six times since August to 2% to tame inflation and policymakers have pledged a gradual return to normal levels consistent with long-term economic growth prospects. BANGKOK, June 25 (Reuters) - Thailand's policy interest rate remains low and further tightening will be gradual to curb inflation risks as the economy continues to recover, a deputy central bank governor said on Sunday.