NEW YORK, April 30 (Reuters) - Standard & Poor's cut Macedonia's credit ratings on Thursday on concerns that deteriorating external liquidity may force the government to abandon its exchange rate peg to the euro.

S&P downgraded Macedonia's long-term foreign-currency sovereign rating to BB from BB-plus. The country's long-term local-currency rating was cut to BB-plus from BBB-minus. The outlook on the ratings is negative. (Reporting by Walter Brandimarte; Editing by Dan Grebler)