* Dollar, yen gain on profit-taking in euro, riskier FX

* Fed pledges to keep rates low; eyes now on ECB, BoE

* More risk ahead, with U.S. jobs data Friday

(Adds quotes, updates prices, changes dateline prvs TOKYO)

By Jessica Mortimer

LONDON, Nov 5 (Reuters) - The dollar and the yen gained broadly on Thursday, paring earlier losses after the Federal Reserve pledged to keep interest rates low, as investors turned cautious before policy decisions in the UK and euro zone.

The U.S. central bank's maintenance of its commitment to keep borrowing costs near zero for an "extended period" as it acknowledged the economy was recovering [ID:nN04453484] sparked a rally in the euro and perceived higher risk currencies.

This soon fizzled, however, as investors took profits on the rally and equities turned sour given the event risk ahead. Closely-watched U.S. jobs data is due on Friday Group of 20 finance ministers meet on Friday and Saturday.