By David Milliken and Matt Falloon

LONDON/NEW YORK (Reuters) - A raft of central bank interest rate decisions on Thursday reinforced investor opinion that the international rates cycle had peaked, with growth risks starting to outweigh the inflation worries of policymakers.

The European Central and Bank of England both held interest rates steady while Sweden's Riksbank and Indonesia's central bank both raised rates by 25 basis points in moves that analysts said were likely to be their last upward tweaks in 2008.

Meanwhile, senior Federal Reserve officials on Thursday hinted that the U.S. central bank could keep interest rates at current levels for some time as the most severe inflation threats pass and economic growth seems on the verge of another slowdown.

San Francisco Federal Reserve Bank President Janet Yellen, in particular, threw her weight behind supporting an economy facing "substantial headwinds" over the next few months after an "ephemeral" pickup in the second quarter.

Speaking in Houston, Dallas Fed President Richard Fisher tempered some of his recent, more strident anti-inflation rhetoric, describing the outlook as more uncertain.

"While it seems pretty clear that economic momentum is slowing, the jury is out on whether lesser momentum will be sufficient to translate into relief on the price front over the intermediate to longer term," Fisher said.

Earlier on Thursday ECB President Jean-Claude Trichet said economic data pointed to weakening growth at mid-year while inflation remained high and risks were to the upside, leaving the ECB little option but to leave interest rates unchanged.

New ECB staff economic projections showed an increase in inflation forecasts and a cut in growth expectations compared with their last prognosis three months ago.