BRUSSELS, Dec 20 (Reuters) - As a corruption scandal rocks the European Parliament, lawmakers and campaign groups say a lack of asset declarations, little reporting on contacts with third countries and barely any sanctions created an environment where rule-breaking could go unpunished or undetected. Prosecutors suspect Greek member of the European Parliament (MEP) Eva Kaili and three others accepted bribes from recent soccer World Cup host Qatar in a bid to influence European Union policymaking. The case, widely dubbed "Qatargate" in the media, is one of the biggest scandals to hit the 27-nation bloc. They also urged the European Commission to put forward a proposal for an independent ethics body as soon as possible. ($1 = 0.9433 euros)Reporting by Philip Blenkinsop; additional reporting by Charlotte Van Campenhout; Editing by Hugh LawsonOur Standards: The Thomson Reuters Trust Principles.

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