BRUSSELS (AP) — Top European officials voiced impatience about stalled negotiations between Greece and its bailout creditors Monday, saying the government in Athens must step up its efforts to meet agreed-upon reform and privatization targets.

Greece must reach an agreement with its international bailout creditors to get the next installment of its 240 billion euro ($328-billion) emergency loan package in order to avoid default in May, when it has to pay back bonds worth about 10 billion euros.