WASHINGTON -- Ben Bernanke, sticking with the Federal Reserve's playbook in his first meeting as chairman, boosted borrowing costs to a five-year high and hinted that an additional interest rate increase could be in store.

Wrapping up a two-day meeting Tuesday, Bernanke and his Fed colleagues struck a mostly positive tone, saying the economy "rebounded strongly" in the January-to-March quarter from an end-of- year lull. But Fed policymakers raised concerns about the potential for inflation to flare up.